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source: vendor/3.5.2/source3/smbd/posix_acls.c

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Last change on this file was 427, checked in by Silvan Scherrer, 16 years ago
Samba 3.5.x: update to 3.5.2
File size: 140.7 KB

Line
1	/*
2	Unix SMB/CIFS implementation.
3	SMB NT Security Descriptor / Unix permission conversion.
4	Copyright (C) Jeremy Allison 1994-2009.
5	Copyright (C) Andreas Gruenbacher 2002.
6	Copyright (C) Simo Sorce <idra@samba.org> 2009.
7
8	This program is free software; you can redistribute it and/or modify
9	it under the terms of the GNU General Public License as published by
10	the Free Software Foundation; either version 3 of the License, or
11	(at your option) any later version.
12
13	This program is distributed in the hope that it will be useful,
14	but WITHOUT ANY WARRANTY; without even the implied warranty of
15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16	GNU General Public License for more details.
17
18	You should have received a copy of the GNU General Public License
19	along with this program. If not, see <http://www.gnu.org/licenses/>.
20	*/
21
22	#include "includes.h"
23
24	extern struct current_user current_user;
25	extern const struct generic_mapping file_generic_mapping;
26
27	#undef DBGC_CLASS
28	#define DBGC_CLASS DBGC_ACLS
29
30	/****************************************************************************
31	Data structures representing the internal ACE format.
32	****************************************************************************/
33
34	enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
35	enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
36
37	typedef union posix_id {
38	uid_t uid;
39	gid_t gid;
40	int world;
41	} posix_id;
42
43	typedef struct canon_ace {
44	struct canon_ace next, prev;
45	SMB_ACL_TAG_T type;
46	mode_t perms; /* Only use S_I(R\|W\|X)USR mode bits here. */
47	DOM_SID trustee;
48	enum ace_owner owner_type;
49	enum ace_attribute attr;
50	posix_id unix_ug;
51	uint8_t ace_flags; /* From windows ACE entry. */
52	} canon_ace;
53
54	#define ALL_ACE_PERMS (S_IRUSR\|S_IWUSR\|S_IXUSR)
55
56	/*
57	* EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
58	* attribute on disk - version 1.
59	* All values are little endian.
60	*
61	* \| 1 \| 1 \| 2 \| 2 \| ....
62	* +------+------+-------------+---------------------+-------------+--------------------+
63	* \| vers \| flag \| num_entries \| num_default_entries \| ..entries.. \| default_entries... \|
64	* +------+------+-------------+---------------------+-------------+--------------------+
65	*
66	* Entry format is :
67	*
68	* \| 1 \| 4 \|
69	* +------+-------------------+
70	* \| value\| uid/gid or world \|
71	* \| type \| value \|
72	* +------+-------------------+
73	*
74	* Version 2 format. Stores extra Windows metadata about an ACL.
75	*
76	* \| 1 \| 2 \| 2 \| 2 \| ....
77	* +------+----------+-------------+---------------------+-------------+--------------------+
78	* \| vers \| ace \| num_entries \| num_default_entries \| ..entries.. \| default_entries... \|
79	* \| 2 \| type \| \| \| \| \|
80	* +------+----------+-------------+---------------------+-------------+--------------------+
81	*
82	* Entry format is :
83	*
84	* \| 1 \| 1 \| 4 \|
85	* +------+------+-------------------+
86	* \| ace \| value\| uid/gid or world \|
87	* \| flag \| type \| value \|
88	* +------+-------------------+------+
89	*
90	*/
91
92	#define PAI_VERSION_OFFSET 0
93
94	#define PAI_V1_FLAG_OFFSET 1
95	#define PAI_V1_NUM_ENTRIES_OFFSET 2
96	#define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET 4
97	#define PAI_V1_ENTRIES_BASE 6
98	#define PAI_V1_ACL_FLAG_PROTECTED 0x1
99	#define PAI_V1_ENTRY_LENGTH 5
100
101	#define PAI_V1_VERSION 1
102
103	#define PAI_V2_TYPE_OFFSET 1
104	#define PAI_V2_NUM_ENTRIES_OFFSET 3
105	#define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET 5
106	#define PAI_V2_ENTRIES_BASE 7
107	#define PAI_V2_ENTRY_LENGTH 6
108
109	#define PAI_V2_VERSION 2
110
111	/*
112	* In memory format of user.SAMBA_PAI attribute.
113	*/
114
115	struct pai_entry {
116	struct pai_entry next, prev;
117	uint8_t ace_flags;
118	enum ace_owner owner_type;
119	posix_id unix_ug;
120	};
121
122	struct pai_val {
123	uint16_t sd_type;
124	unsigned int num_entries;
125	struct pai_entry *entry_list;
126	unsigned int num_def_entries;
127	struct pai_entry *def_entry_list;
128	};
129
130	/************************************************************************
131	Return a uint32 of the pai_entry principal.
132	************************************************************************/
133
134	static uint32_t get_pai_entry_val(struct pai_entry *paie)
135	{
136	switch (paie->owner_type) {
137	case UID_ACE:
138	DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
139	return (uint32_t)paie->unix_ug.uid;
140	case GID_ACE:
141	DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
142	return (uint32_t)paie->unix_ug.gid;
143	case WORLD_ACE:
144	default:
145	DEBUG(10,("get_pai_entry_val: world ace\n"));
146	return (uint32_t)-1;
147	}
148	}
149
150	/************************************************************************
151	Return a uint32 of the entry principal.
152	************************************************************************/
153
154	static uint32_t get_entry_val(canon_ace *ace_entry)
155	{
156	switch (ace_entry->owner_type) {
157	case UID_ACE:
158	DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
159	return (uint32_t)ace_entry->unix_ug.uid;
160	case GID_ACE:
161	DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
162	return (uint32_t)ace_entry->unix_ug.gid;
163	case WORLD_ACE:
164	default:
165	DEBUG(10,("get_entry_val: world ace\n"));
166	return (uint32_t)-1;
167	}
168	}
169
170	/************************************************************************
171	Create the on-disk format (always v2 now). Caller must free.
172	************************************************************************/
173
174	static char create_pai_buf_v2(canon_ace file_ace_list,
175	canon_ace *dir_ace_list,
176	uint16_t sd_type,
177	size_t *store_size)
178	{
179	char *pai_buf = NULL;
180	canon_ace *ace_list = NULL;
181	char *entry_offset = NULL;
182	unsigned int num_entries = 0;
183	unsigned int num_def_entries = 0;
184	unsigned int i;
185
186	for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
187	num_entries++;
188	}
189
190	for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
191	num_def_entries++;
192	}
193
194	DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
195
196	*store_size = PAI_V2_ENTRIES_BASE +
197	((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
198
199	pai_buf = (char )SMB_MALLOC(store_size);
200	if (!pai_buf) {
201	return NULL;
202	}
203
204	/* Set up the header. */
205	memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
206	SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
207	SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
208	SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
209	SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
210
211	DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
212	(unsigned int)sd_type ));
213
214	entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
215
216	i = 0;
217	for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
218	uint8_t type_val = (uint8_t)ace_list->owner_type;
219	uint32_t entry_val = get_entry_val(ace_list);
220
221	SCVAL(entry_offset,0,ace_list->ace_flags);
222	SCVAL(entry_offset,1,type_val);
223	SIVAL(entry_offset,2,entry_val);
224	DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
225	i,
226	(unsigned int)ace_list->ace_flags,
227	(unsigned int)type_val,
228	(unsigned int)entry_val ));
229	i++;
230	entry_offset += PAI_V2_ENTRY_LENGTH;
231	}
232
233	for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
234	uint8_t type_val = (uint8_t)ace_list->owner_type;
235	uint32_t entry_val = get_entry_val(ace_list);
236
237	SCVAL(entry_offset,0,ace_list->ace_flags);
238	SCVAL(entry_offset,1,type_val);
239	SIVAL(entry_offset,2,entry_val);
240	DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
241	i,
242	(unsigned int)ace_list->ace_flags,
243	(unsigned int)type_val,
244	(unsigned int)entry_val ));
245	i++;
246	entry_offset += PAI_V2_ENTRY_LENGTH;
247	}
248
249	return pai_buf;
250	}
251
252	/************************************************************************
253	Store the user.SAMBA_PAI attribute on disk.
254	************************************************************************/
255
256	static void store_inheritance_attributes(files_struct *fsp,
257	canon_ace *file_ace_list,
258	canon_ace *dir_ace_list,
259	uint16_t sd_type)
260	{
261	int ret;
262	size_t store_size;
263	char *pai_buf;
264
265	if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
266	return;
267	}
268
269	pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
270	sd_type, &store_size);
271
272	if (fsp->fh->fd != -1) {
273	ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
274	pai_buf, store_size, 0);
275	} else {
276	ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
277	SAMBA_POSIX_INHERITANCE_EA_NAME,
278	pai_buf, store_size, 0);
279	}
280
281	SAFE_FREE(pai_buf);
282
283	DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
284	(unsigned int)sd_type,
285	fsp_str_dbg(fsp)));
286
287	if (ret == -1 && !no_acl_syscall_error(errno)) {
288	DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
289	}
290	}
291
292	/************************************************************************
293	Delete the in memory inheritance info.
294	************************************************************************/
295
296	static void free_inherited_info(struct pai_val *pal)
297	{
298	if (pal) {
299	struct pai_entry paie, paie_next;
300	for (paie = pal->entry_list; paie; paie = paie_next) {
301	paie_next = paie->next;
302	SAFE_FREE(paie);
303	}
304	for (paie = pal->def_entry_list; paie; paie = paie_next) {
305	paie_next = paie->next;
306	SAFE_FREE(paie);
307	}
308	SAFE_FREE(pal);
309	}
310	}
311
312	/************************************************************************
313	Get any stored ACE flags.
314	************************************************************************/
315
316	static uint16_t get_pai_flags(struct pai_val pal, canon_ace ace_entry, bool default_ace)
317	{
318	struct pai_entry *paie;
319
320	if (!pal) {
321	return 0;
322	}
323
324	/* If the entry exists it is inherited. */
325	for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
326	if (ace_entry->owner_type == paie->owner_type &&
327	get_entry_val(ace_entry) == get_pai_entry_val(paie))
328	return paie->ace_flags;
329	}
330	return 0;
331	}
332
333	/************************************************************************
334	Ensure an attribute just read is valid - v1.
335	************************************************************************/
336
337	static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
338	{
339	uint16 num_entries;
340	uint16 num_def_entries;
341
342	if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
343	/* Corrupted - too small. */
344	return false;
345	}
346
347	if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
348	return false;
349	}
350
351	num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
352	num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
353
354	/* Check the entry lists match. */
355	/* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
356
357	if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
358	PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
359	return false;
360	}
361
362	return true;
363	}
364
365	/************************************************************************
366	Ensure an attribute just read is valid - v2.
367	************************************************************************/
368
369	static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
370	{
371	uint16 num_entries;
372	uint16 num_def_entries;
373
374	if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
375	/* Corrupted - too small. */
376	return false;
377	}
378
379	if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
380	return false;
381	}
382
383	num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
384	num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
385
386	/* Check the entry lists match. */
387	/* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
388
389	if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
390	PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
391	return false;
392	}
393
394	return true;
395	}
396
397	/************************************************************************
398	Decode the owner.
399	************************************************************************/
400
401	static bool get_pai_owner_type(struct pai_entry paie, const char entry_offset)
402	{
403	paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
404	switch( paie->owner_type) {
405	case UID_ACE:
406	paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
407	DEBUG(10,("get_pai_owner_type: uid = %u\n",
408	(unsigned int)paie->unix_ug.uid ));
409	break;
410	case GID_ACE:
411	paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
412	DEBUG(10,("get_pai_owner_type: gid = %u\n",
413	(unsigned int)paie->unix_ug.gid ));
414	break;
415	case WORLD_ACE:
416	paie->unix_ug.world = -1;
417	DEBUG(10,("get_pai_owner_type: world ace\n"));
418	break;
419	default:
420	DEBUG(10,("get_pai_owner_type: unknown type %u\n",
421	(unsigned int)paie->owner_type ));
422	return false;
423	}
424	return true;
425	}
426
427	/************************************************************************
428	Process v2 entries.
429	************************************************************************/
430
431	static const char create_pai_v1_entries(struct pai_val paiv,
432	const char *entry_offset,
433	bool def_entry)
434	{
435	int i;
436
437	for (i = 0; i < paiv->num_entries; i++) {
438	struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
439	if (!paie) {
440	return NULL;
441	}
442
443	paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
444	if (!get_pai_owner_type(paie, entry_offset)) {
445	return NULL;
446	}
447
448	if (!def_entry) {
449	DLIST_ADD(paiv->entry_list, paie);
450	} else {
451	DLIST_ADD(paiv->def_entry_list, paie);
452	}
453	entry_offset += PAI_V1_ENTRY_LENGTH;
454	}
455	return entry_offset;
456	}
457
458	/************************************************************************
459	Convert to in-memory format from version 1.
460	************************************************************************/
461
462	static struct pai_val create_pai_val_v1(const char buf, size_t size)
463	{
464	const char *entry_offset;
465	struct pai_val *paiv = NULL;
466
467	if (!check_pai_ok_v1(buf, size)) {
468	return NULL;
469	}
470
471	paiv = SMB_MALLOC_P(struct pai_val);
472	if (!paiv) {
473	return NULL;
474	}
475
476	memset(paiv, '\0', sizeof(struct pai_val));
477
478	paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
479	SE_DESC_DACL_PROTECTED : 0;
480
481	paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
482	paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
483
484	entry_offset = buf + PAI_V1_ENTRIES_BASE;
485
486	DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
487	paiv->num_entries, paiv->num_def_entries ));
488
489	entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
490	if (entry_offset == NULL) {
491	free_inherited_info(paiv);
492	return NULL;
493	}
494	entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
495	if (entry_offset == NULL) {
496	free_inherited_info(paiv);
497	return NULL;
498	}
499
500	return paiv;
501	}
502
503	/************************************************************************
504	Process v2 entries.
505	************************************************************************/
506
507	static const char create_pai_v2_entries(struct pai_val paiv,
508	unsigned int num_entries,
509	const char *entry_offset,
510	bool def_entry)
511	{
512	unsigned int i;
513
514	for (i = 0; i < num_entries; i++) {
515	struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
516	if (!paie) {
517	return NULL;
518	}
519
520	paie->ace_flags = CVAL(entry_offset,0);
521
522	if (!get_pai_owner_type(paie, entry_offset+1)) {
523	return NULL;
524	}
525	if (!def_entry) {
526	DLIST_ADD(paiv->entry_list, paie);
527	} else {
528	DLIST_ADD(paiv->def_entry_list, paie);
529	}
530	entry_offset += PAI_V2_ENTRY_LENGTH;
531	}
532	return entry_offset;
533	}
534
535	/************************************************************************
536	Convert to in-memory format from version 2.
537	************************************************************************/
538
539	static struct pai_val create_pai_val_v2(const char buf, size_t size)
540	{
541	const char *entry_offset;
542	struct pai_val *paiv = NULL;
543
544	if (!check_pai_ok_v2(buf, size)) {
545	return NULL;
546	}
547
548	paiv = SMB_MALLOC_P(struct pai_val);
549	if (!paiv) {
550	return NULL;
551	}
552
553	memset(paiv, '\0', sizeof(struct pai_val));
554
555	paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
556
557	paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
558	paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
559
560	entry_offset = buf + PAI_V2_ENTRIES_BASE;
561
562	DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
563	(unsigned int)paiv->sd_type,
564	paiv->num_entries, paiv->num_def_entries ));
565
566	entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
567	entry_offset, false);
568	if (entry_offset == NULL) {
569	free_inherited_info(paiv);
570	return NULL;
571	}
572	entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
573	entry_offset, true);
574	if (entry_offset == NULL) {
575	free_inherited_info(paiv);
576	return NULL;
577	}
578
579	return paiv;
580	}
581
582	/************************************************************************
583	Convert to in-memory format - from either version 1 or 2.
584	************************************************************************/
585
586	static struct pai_val create_pai_val(const char buf, size_t size)
587	{
588	if (size < 1) {
589	return NULL;
590	}
591	if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
592	return create_pai_val_v1(buf, size);
593	} else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
594	return create_pai_val_v2(buf, size);
595	} else {
596	return NULL;
597	}
598	}
599
600	/************************************************************************
601	Load the user.SAMBA_PAI attribute.
602	************************************************************************/
603
604	static struct pai_val fload_inherited_info(files_struct fsp)
605	{
606	char *pai_buf;
607	size_t pai_buf_size = 1024;
608	struct pai_val *paiv = NULL;
609	ssize_t ret;
610
611	if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
612	return NULL;
613	}
614
615	if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
616	return NULL;
617	}
618
619	do {
620	if (fsp->fh->fd != -1) {
621	ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
622	pai_buf, pai_buf_size);
623	} else {
624	ret = SMB_VFS_GETXATTR(fsp->conn,
625	fsp->fsp_name->base_name,
626	SAMBA_POSIX_INHERITANCE_EA_NAME,
627	pai_buf, pai_buf_size);
628	}
629
630	if (ret == -1) {
631	if (errno != ERANGE) {
632	break;
633	}
634	/* Buffer too small - enlarge it. */
635	pai_buf_size *= 2;
636	SAFE_FREE(pai_buf);
637	if (pai_buf_size > 1024*1024) {
638	return NULL; /* Limit malloc to 1mb. */
639	}
640	if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
641	return NULL;
642	}
643	} while (ret == -1);
644
645	DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
646	(unsigned long)ret, fsp_str_dbg(fsp)));
647
648	if (ret == -1) {
649	/* No attribute or not supported. */
650	#if defined(ENOATTR)
651	if (errno != ENOATTR)
652	DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
653	#else
654	if (errno != ENOSYS)
655	DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
656	#endif
657	SAFE_FREE(pai_buf);
658	return NULL;
659	}
660
661	paiv = create_pai_val(pai_buf, ret);
662
663	if (paiv) {
664	DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
665	(unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
666	}
667
668	SAFE_FREE(pai_buf);
669	return paiv;
670	}
671
672	/************************************************************************
673	Load the user.SAMBA_PAI attribute.
674	************************************************************************/
675
676	static struct pai_val load_inherited_info(const struct connection_struct conn,
677	const char *fname)
678	{
679	char *pai_buf;
680	size_t pai_buf_size = 1024;
681	struct pai_val *paiv = NULL;
682	ssize_t ret;
683
684	if (!lp_map_acl_inherit(SNUM(conn))) {
685	return NULL;
686	}
687
688	if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
689	return NULL;
690	}
691
692	do {
693	ret = SMB_VFS_GETXATTR(conn, fname,
694	SAMBA_POSIX_INHERITANCE_EA_NAME,
695	pai_buf, pai_buf_size);
696
697	if (ret == -1) {
698	if (errno != ERANGE) {
699	break;
700	}
701	/* Buffer too small - enlarge it. */
702	pai_buf_size *= 2;
703	SAFE_FREE(pai_buf);
704	if (pai_buf_size > 1024*1024) {
705	return NULL; /* Limit malloc to 1mb. */
706	}
707	if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
708	return NULL;
709	}
710	} while (ret == -1);
711
712	DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
713
714	if (ret == -1) {
715	/* No attribute or not supported. */
716	#if defined(ENOATTR)
717	if (errno != ENOATTR)
718	DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
719	#else
720	if (errno != ENOSYS)
721	DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
722	#endif
723	SAFE_FREE(pai_buf);
724	return NULL;
725	}
726
727	paiv = create_pai_val(pai_buf, ret);
728
729	if (paiv) {
730	DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
731	(unsigned int)paiv->sd_type,
732	fname));
733	}
734
735	SAFE_FREE(pai_buf);
736	return paiv;
737	}
738
739	/****************************************************************************
740	Functions to manipulate the internal ACE format.
741	****************************************************************************/
742
743	/****************************************************************************
744	Count a linked list of canonical ACE entries.
745	****************************************************************************/
746
747	static size_t count_canon_ace_list( canon_ace *l_head )
748	{
749	size_t count = 0;
750	canon_ace *ace;
751
752	for (ace = l_head; ace; ace = ace->next)
753	count++;
754
755	return count;
756	}
757
758	/****************************************************************************
759	Free a linked list of canonical ACE entries.
760	****************************************************************************/
761
762	static void free_canon_ace_list( canon_ace *l_head )
763	{
764	canon_ace list, next;
765
766	for (list = l_head; list; list = next) {
767	next = list->next;
768	DLIST_REMOVE(l_head, list);
769	SAFE_FREE(list);
770	}
771	}
772
773	/****************************************************************************
774	Function to duplicate a canon_ace entry.
775	****************************************************************************/
776
777	static canon_ace dup_canon_ace( canon_ace src_ace)
778	{
779	canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
780
781	if (dst_ace == NULL)
782	return NULL;
783
784	dst_ace = src_ace;
785	dst_ace->prev = dst_ace->next = NULL;
786	return dst_ace;
787	}
788
789	/****************************************************************************
790	Print out a canon ace.
791	****************************************************************************/
792
793	static void print_canon_ace(canon_ace *pace, int num)
794	{
795	dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
796	dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
797	if (pace->owner_type == UID_ACE) {
798	const char *u_name = uidtoname(pace->unix_ug.uid);
799	dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
800	} else if (pace->owner_type == GID_ACE) {
801	char *g_name = gidtoname(pace->unix_ug.gid);
802	dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
803	} else
804	dbgtext( "other ");
805	switch (pace->type) {
806	case SMB_ACL_USER:
807	dbgtext( "SMB_ACL_USER ");
808	break;
809	case SMB_ACL_USER_OBJ:
810	dbgtext( "SMB_ACL_USER_OBJ ");
811	break;
812	case SMB_ACL_GROUP:
813	dbgtext( "SMB_ACL_GROUP ");
814	break;
815	case SMB_ACL_GROUP_OBJ:
816	dbgtext( "SMB_ACL_GROUP_OBJ ");
817	break;
818	case SMB_ACL_OTHER:
819	dbgtext( "SMB_ACL_OTHER ");
820	break;
821	default:
822	dbgtext( "MASK " );
823	break;
824	}
825
826	dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
827	dbgtext( "perms ");
828	dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
829	dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
830	dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
831	}
832
833	/****************************************************************************
834	Print out a canon ace list.
835	****************************************************************************/
836
837	static void print_canon_ace_list(const char name, canon_ace ace_list)
838	{
839	int count = 0;
840
841	if( DEBUGLVL( 10 )) {
842	dbgtext( "print_canon_ace_list: %s\n", name );
843	for (;ace_list; ace_list = ace_list->next, count++)
844	print_canon_ace(ace_list, count );
845	}
846	}
847
848	/****************************************************************************
849	Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R\|W\|X)USR bits).
850	****************************************************************************/
851
852	static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
853	{
854	mode_t ret = 0;
855
856	ret \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
857	ret \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
858	ret \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
859
860	return ret;
861	}
862
863	/****************************************************************************
864	Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R\|W\|X)USR bits).
865	****************************************************************************/
866
867	static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
868	{
869	mode_t ret = 0;
870
871	if (mode & r_mask)
872	ret \|= S_IRUSR;
873	if (mode & w_mask)
874	ret \|= S_IWUSR;
875	if (mode & x_mask)
876	ret \|= S_IXUSR;
877
878	return ret;
879	}
880
881	/****************************************************************************
882	Map canon_ace permissions (a mode_t containing only S_(R\|W\|X)USR bits) to
883	an SMB_ACL_PERMSET_T.
884	****************************************************************************/
885
886	static int map_acl_perms_to_permset(connection_struct conn, mode_t mode, SMB_ACL_PERMSET_T p_permset)
887	{
888	if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1)
889	return -1;
890	if (mode & S_IRUSR) {
891	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
892	return -1;
893	}
894	if (mode & S_IWUSR) {
895	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
896	return -1;
897	}
898	if (mode & S_IXUSR) {
899	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
900	return -1;
901	}
902	return 0;
903	}
904
905	/****************************************************************************
906	Function to create owner and group SIDs from a SMB_STRUCT_STAT.
907	****************************************************************************/
908
909	void create_file_sids(const SMB_STRUCT_STAT psbuf, DOM_SID powner_sid, DOM_SID *pgroup_sid)
910	{
911	uid_to_sid( powner_sid, psbuf->st_ex_uid );
912	gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
913	}
914
915	/****************************************************************************
916	Merge aces with a common sid - if both are allow or deny, OR the permissions together and
917	delete the second one. If the first is deny, mask the permissions off and delete the allow
918	if the permissions become zero, delete the deny if the permissions are non zero.
919	****************************************************************************/
920
921	static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
922	{
923	canon_ace l_head = pp_list_head;
924	canon_ace *curr_ace_outer;
925	canon_ace *curr_ace_outer_next;
926
927	/*
928	* First, merge allow entries with identical SIDs, and deny entries
929	* with identical SIDs.
930	*/
931
932	for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
933	canon_ace *curr_ace;
934	canon_ace *curr_ace_next;
935
936	curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
937
938	for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
939	bool can_merge = false;
940
941	curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
942
943	/* For file ACLs we can merge if the SIDs and ALLOW/DENY
944	* types are the same. For directory acls we must also
945	* ensure the POSIX ACL types are the same. */
946
947	if (!dir_acl) {
948	can_merge = (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
949	(curr_ace->attr == curr_ace_outer->attr));
950	} else {
951	can_merge = (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
952	(curr_ace->type == curr_ace_outer->type) &&
953	(curr_ace->attr == curr_ace_outer->attr));
954	}
955
956	if (can_merge) {
957	if( DEBUGLVL( 10 )) {
958	dbgtext("merge_aces: Merging ACE's\n");
959	print_canon_ace( curr_ace_outer, 0);
960	print_canon_ace( curr_ace, 0);
961	}
962
963	/* Merge two allow or two deny ACE's. */
964
965	/* Theoretically we shouldn't merge a dir ACE if
966	* one ACE has the CI flag set, and the other
967	* ACE has the OI flag set, but this is rare
968	* enough we can ignore it. */
969
970	curr_ace_outer->perms \|= curr_ace->perms;
971	curr_ace_outer->ace_flags \|= curr_ace->ace_flags;
972	DLIST_REMOVE(l_head, curr_ace);
973	SAFE_FREE(curr_ace);
974	curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
975	}
976	}
977	}
978
979	/*
980	* Now go through and mask off allow permissions with deny permissions.
981	* We can delete either the allow or deny here as we know that each SID
982	* appears only once in the list.
983	*/
984
985	for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
986	canon_ace *curr_ace;
987	canon_ace *curr_ace_next;
988
989	curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
990
991	for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
992
993	curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
994
995	/*
996	* Subtract ACE's with different entries. Due to the ordering constraints
997	* we've put on the ACL, we know the deny must be the first one.
998	*/
999
1000	if (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
1001	(curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1002
1003	if( DEBUGLVL( 10 )) {
1004	dbgtext("merge_aces: Masking ACE's\n");
1005	print_canon_ace( curr_ace_outer, 0);
1006	print_canon_ace( curr_ace, 0);
1007	}
1008
1009	curr_ace->perms &= ~curr_ace_outer->perms;
1010
1011	if (curr_ace->perms == 0) {
1012
1013	/*
1014	* The deny overrides the allow. Remove the allow.
1015	*/
1016
1017	DLIST_REMOVE(l_head, curr_ace);
1018	SAFE_FREE(curr_ace);
1019	curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1020
1021	} else {
1022
1023	/*
1024	* Even after removing permissions, there
1025	* are still allow permissions - delete the deny.
1026	* It is safe to delete the deny here,
1027	* as we are guarenteed by the deny first
1028	* ordering that all the deny entries for
1029	* this SID have already been merged into one
1030	* before we can get to an allow ace.
1031	*/
1032
1033	DLIST_REMOVE(l_head, curr_ace_outer);
1034	SAFE_FREE(curr_ace_outer);
1035	break;
1036	}
1037	}
1038
1039	} /* end for curr_ace */
1040	} /* end for curr_ace_outer */
1041
1042	/* We may have modified the list. */
1043
1044	*pp_list_head = l_head;
1045	}
1046
1047	/****************************************************************************
1048	Check if we need to return NT4.x compatible ACL entries.
1049	****************************************************************************/
1050
1051	bool nt4_compatible_acls(void)
1052	{
1053	int compat = lp_acl_compatibility();
1054
1055	if (compat == ACL_COMPAT_AUTO) {
1056	enum remote_arch_types ra_type = get_remote_arch();
1057
1058	/* Automatically adapt to client */
1059	return (ra_type <= RA_WINNT);
1060	} else
1061	return (compat == ACL_COMPAT_WINNT);
1062	}
1063
1064
1065	/****************************************************************************
1066	Map canon_ace perms to permission bits NT.
1067	The attr element is not used here - we only process deny entries on set,
1068	not get. Deny entries are implicit on get with ace->perms = 0.
1069	****************************************************************************/
1070
1071	uint32_t map_canon_ace_perms(int snum,
1072	enum security_ace_type *pacl_type,
1073	mode_t perms,
1074	bool directory_ace)
1075	{
1076	uint32_t nt_mask = 0;
1077
1078	*pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1079
1080	if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1081	if (directory_ace) {
1082	nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1083	} else {
1084	nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1085	}
1086	} else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1087	/*
1088	* Windows NT refuses to display ACEs with no permissions in them (but
1089	* they are perfectly legal with Windows 2000). If the ACE has empty
1090	* permissions we cannot use 0, so we use the otherwise unused
1091	* WRITE_OWNER permission, which we ignore when we set an ACL.
1092	* We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1093	* to be changed in the future.
1094	*/
1095
1096	if (nt4_compatible_acls())
1097	nt_mask = UNIX_ACCESS_NONE;
1098	else
1099	nt_mask = 0;
1100	} else {
1101	if (directory_ace) {
1102	nt_mask \|= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1103	nt_mask \|= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1104	nt_mask \|= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1105	} else {
1106	nt_mask \|= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1107	nt_mask \|= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1108	nt_mask \|= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1109	}
1110	}
1111
1112	if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1113	nt_mask \|= (SEC_STD_WRITE_DAC\|SEC_STD_WRITE_OWNER\|DELETE_ACCESS);
1114	}
1115
1116	DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1117	(unsigned int)perms, (unsigned int)nt_mask ));
1118
1119	return nt_mask;
1120	}
1121
1122	/****************************************************************************
1123	Map NT perms to a UNIX mode_t.
1124	****************************************************************************/
1125
1126	#define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA\|FILE_READ_EA\|FILE_READ_ATTRIBUTES)
1127	#define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA\|FILE_APPEND_DATA\|FILE_WRITE_EA\|FILE_WRITE_ATTRIBUTES)
1128	#define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1129
1130	static mode_t map_nt_perms( uint32 *mask, int type)
1131	{
1132	mode_t mode = 0;
1133
1134	switch(type) {
1135	case S_IRUSR:
1136	if((*mask) & GENERIC_ALL_ACCESS)
1137	mode = S_IRUSR\|S_IWUSR\|S_IXUSR;
1138	else {
1139	mode \|= ((*mask) & (GENERIC_READ_ACCESS\|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1140	mode \|= ((*mask) & (GENERIC_WRITE_ACCESS\|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1141	mode \|= ((*mask) & (GENERIC_EXECUTE_ACCESS\|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1142	}
1143	break;
1144	case S_IRGRP:
1145	if((*mask) & GENERIC_ALL_ACCESS)
1146	mode = S_IRGRP\|S_IWGRP\|S_IXGRP;
1147	else {
1148	mode \|= ((*mask) & (GENERIC_READ_ACCESS\|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1149	mode \|= ((*mask) & (GENERIC_WRITE_ACCESS\|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1150	mode \|= ((*mask) & (GENERIC_EXECUTE_ACCESS\|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1151	}
1152	break;
1153	case S_IROTH:
1154	if((*mask) & GENERIC_ALL_ACCESS)
1155	mode = S_IROTH\|S_IWOTH\|S_IXOTH;
1156	else {
1157	mode \|= ((*mask) & (GENERIC_READ_ACCESS\|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1158	mode \|= ((*mask) & (GENERIC_WRITE_ACCESS\|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1159	mode \|= ((*mask) & (GENERIC_EXECUTE_ACCESS\|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1160	}
1161	break;
1162	}
1163
1164	return mode;
1165	}
1166
1167	/****************************************************************************
1168	Unpack a SEC_DESC into a UNIX owner and group.
1169	****************************************************************************/
1170
1171	NTSTATUS unpack_nt_owners(int snum, uid_t puser, gid_t pgrp, uint32 security_info_sent, const SEC_DESC *psd)
1172	{
1173	DOM_SID owner_sid;
1174	DOM_SID grp_sid;
1175
1176	*puser = (uid_t)-1;
1177	*pgrp = (gid_t)-1;
1178
1179	if(security_info_sent == 0) {
1180	DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1181	return NT_STATUS_OK;
1182	}
1183
1184	/*
1185	* Validate the owner and group SID's.
1186	*/
1187
1188	memset(&owner_sid, '\0', sizeof(owner_sid));
1189	memset(&grp_sid, '\0', sizeof(grp_sid));
1190
1191	DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1192
1193	/*
1194	* Don't immediately fail if the owner sid cannot be validated.
1195	* This may be a group chown only set.
1196	*/
1197
1198	if (security_info_sent & OWNER_SECURITY_INFORMATION) {
1199	sid_copy(&owner_sid, psd->owner_sid);
1200	if (!sid_to_uid(&owner_sid, puser)) {
1201	if (lp_force_unknown_acl_user(snum)) {
1202	/* this allows take ownership to work
1203	* reasonably */
1204	*puser = current_user.ut.uid;
1205	} else {
1206	DEBUG(3,("unpack_nt_owners: unable to validate"
1207	" owner sid for %s\n",
1208	sid_string_dbg(&owner_sid)));
1209	return NT_STATUS_INVALID_OWNER;
1210	}
1211	}
1212	DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1213	(unsigned int)*puser ));
1214	}
1215
1216	/*
1217	* Don't immediately fail if the group sid cannot be validated.
1218	* This may be an owner chown only set.
1219	*/
1220
1221	if (security_info_sent & GROUP_SECURITY_INFORMATION) {
1222	sid_copy(&grp_sid, psd->group_sid);
1223	if (!sid_to_gid( &grp_sid, pgrp)) {
1224	if (lp_force_unknown_acl_user(snum)) {
1225	/* this allows take group ownership to work
1226	* reasonably */
1227	*pgrp = current_user.ut.gid;
1228	} else {
1229	DEBUG(3,("unpack_nt_owners: unable to validate"
1230	" group sid.\n"));
1231	return NT_STATUS_INVALID_OWNER;
1232	}
1233	}
1234	DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1235	(unsigned int)*pgrp));
1236	}
1237
1238	DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1239
1240	return NT_STATUS_OK;
1241	}
1242
1243	/****************************************************************************
1244	Ensure the enforced permissions for this share apply.
1245	****************************************************************************/
1246
1247	static void apply_default_perms(const struct share_params *params,
1248	const bool is_directory, canon_ace *pace,
1249	mode_t type)
1250	{
1251	mode_t and_bits = (mode_t)0;
1252	mode_t or_bits = (mode_t)0;
1253
1254	/* Get the initial bits to apply. */
1255
1256	if (is_directory) {
1257	and_bits = lp_dir_security_mask(params->service);
1258	or_bits = lp_force_dir_security_mode(params->service);
1259	} else {
1260	and_bits = lp_security_mask(params->service);
1261	or_bits = lp_force_security_mode(params->service);
1262	}
1263
1264	/* Now bounce them into the S_USR space. */
1265	switch(type) {
1266	case S_IRUSR:
1267	/* Ensure owner has read access. */
1268	pace->perms \|= S_IRUSR;
1269	if (is_directory)
1270	pace->perms \|= (S_IWUSR\|S_IXUSR);
1271	and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1272	or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1273	break;
1274	case S_IRGRP:
1275	and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1276	or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1277	break;
1278	case S_IROTH:
1279	and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1280	or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1281	break;
1282	}
1283
1284	pace->perms = ((pace->perms & and_bits)\|or_bits);
1285	}
1286
1287	/****************************************************************************
1288	Check if a given uid/SID is in a group gid/SID. This is probably very
1289	expensive and will need optimisation. A lot of optimisation :-). JRA.
1290	****************************************************************************/
1291
1292	static bool uid_entry_in_group( canon_ace uid_ace, canon_ace group_ace )
1293	{
1294	const char *u_name = NULL;
1295
1296	/* "Everyone" always matches every uid. */
1297
1298	if (sid_equal(&group_ace->trustee, &global_sid_World))
1299	return True;
1300
1301	/*
1302	* if it's the current user, we already have the unix token
1303	* and don't need to do the complex user_in_group_sid() call
1304	*/
1305	if (uid_ace->unix_ug.uid == current_user.ut.uid) {
1306	size_t i;
1307
1308	if (group_ace->unix_ug.gid == current_user.ut.gid) {
1309	return True;
1310	}
1311
1312	for (i=0; i < current_user.ut.ngroups; i++) {
1313	if (group_ace->unix_ug.gid == current_user.ut.groups[i]) {
1314	return True;
1315	}
1316	}
1317	}
1318
1319	/* u_name talloc'ed off tos. */
1320	u_name = uidtoname(uid_ace->unix_ug.uid);
1321	if (!u_name) {
1322	return False;
1323	}
1324
1325	/*
1326	* user_in_group_sid() uses create_token_from_username()
1327	* which creates an artificial NT token given just a username,
1328	* so this is not reliable for users from foreign domains
1329	* exported by winbindd!
1330	*/
1331	return user_in_group_sid(u_name, &group_ace->trustee);
1332	}
1333
1334	/****************************************************************************
1335	A well formed POSIX file or default ACL has at least 3 entries, a
1336	SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1337	In addition, the owner must always have at least read access.
1338	When using this call on get_acl, the pst struct is valid and contains
1339	the mode of the file. When using this call on set_acl, the pst struct has
1340	been modified to have a mode containing the default for this file or directory
1341	type.
1342	****************************************************************************/
1343
1344	static bool ensure_canon_entry_valid(canon_ace **pp_ace,
1345	const struct share_params *params,
1346	const bool is_directory,
1347	const DOM_SID *pfile_owner_sid,
1348	const DOM_SID *pfile_grp_sid,
1349	const SMB_STRUCT_STAT *pst,
1350	bool setting_acl)
1351	{
1352	canon_ace *pace;
1353	bool got_user = False;
1354	bool got_grp = False;
1355	bool got_other = False;
1356	canon_ace *pace_other = NULL;
1357
1358	for (pace = *pp_ace; pace; pace = pace->next) {
1359	if (pace->type == SMB_ACL_USER_OBJ) {
1360
1361	if (setting_acl)
1362	apply_default_perms(params, is_directory, pace, S_IRUSR);
1363	got_user = True;
1364
1365	} else if (pace->type == SMB_ACL_GROUP_OBJ) {
1366
1367	/*
1368	* Ensure create mask/force create mode is respected on set.
1369	*/
1370
1371	if (setting_acl)
1372	apply_default_perms(params, is_directory, pace, S_IRGRP);
1373	got_grp = True;
1374
1375	} else if (pace->type == SMB_ACL_OTHER) {
1376
1377	/*
1378	* Ensure create mask/force create mode is respected on set.
1379	*/
1380
1381	if (setting_acl)
1382	apply_default_perms(params, is_directory, pace, S_IROTH);
1383	got_other = True;
1384	pace_other = pace;
1385	}
1386	}
1387
1388	if (!got_user) {
1389	if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1390	DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1391	return False;
1392	}
1393
1394	ZERO_STRUCTP(pace);
1395	pace->type = SMB_ACL_USER_OBJ;
1396	pace->owner_type = UID_ACE;
1397	pace->unix_ug.uid = pst->st_ex_uid;
1398	pace->trustee = *pfile_owner_sid;
1399	pace->attr = ALLOW_ACE;
1400
1401	if (setting_acl) {
1402	/* See if the owning user is in any of the other groups in
1403	the ACE. If so, OR in the permissions from that group. */
1404
1405	bool group_matched = False;
1406	canon_ace *pace_iter;
1407
1408	for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1409	if (pace_iter->type == SMB_ACL_GROUP_OBJ \|\| pace_iter->type == SMB_ACL_GROUP) {
1410	if (uid_entry_in_group(pace, pace_iter)) {
1411	pace->perms \|= pace_iter->perms;
1412	group_matched = True;
1413	}
1414	}
1415	}
1416
1417	/* If we only got an "everyone" perm, just use that. */
1418	if (!group_matched) {
1419	if (got_other)
1420	pace->perms = pace_other->perms;
1421	else
1422	pace->perms = 0;
1423	}
1424
1425	apply_default_perms(params, is_directory, pace, S_IRUSR);
1426	} else {
1427	pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1428	}
1429
1430	DLIST_ADD(*pp_ace, pace);
1431	}
1432
1433	if (!got_grp) {
1434	if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1435	DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1436	return False;
1437	}
1438
1439	ZERO_STRUCTP(pace);
1440	pace->type = SMB_ACL_GROUP_OBJ;
1441	pace->owner_type = GID_ACE;
1442	pace->unix_ug.uid = pst->st_ex_gid;
1443	pace->trustee = *pfile_grp_sid;
1444	pace->attr = ALLOW_ACE;
1445	if (setting_acl) {
1446	/* If we only got an "everyone" perm, just use that. */
1447	if (got_other)
1448	pace->perms = pace_other->perms;
1449	else
1450	pace->perms = 0;
1451	apply_default_perms(params, is_directory, pace, S_IRGRP);
1452	} else {
1453	pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1454	}
1455
1456	DLIST_ADD(*pp_ace, pace);
1457	}
1458
1459	if (!got_other) {
1460	if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1461	DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1462	return False;
1463	}
1464
1465	ZERO_STRUCTP(pace);
1466	pace->type = SMB_ACL_OTHER;
1467	pace->owner_type = WORLD_ACE;
1468	pace->unix_ug.world = -1;
1469	pace->trustee = global_sid_World;
1470	pace->attr = ALLOW_ACE;
1471	if (setting_acl) {
1472	pace->perms = 0;
1473	apply_default_perms(params, is_directory, pace, S_IROTH);
1474	} else
1475	pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1476
1477	DLIST_ADD(*pp_ace, pace);
1478	}
1479
1480	return True;
1481	}
1482
1483	/****************************************************************************
1484	Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1485	If it does not have them, check if there are any entries where the trustee is the
1486	file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1487	****************************************************************************/
1488
1489	static void check_owning_objs(canon_ace ace, DOM_SID pfile_owner_sid, DOM_SID *pfile_grp_sid)
1490	{
1491	bool got_user_obj, got_group_obj;
1492	canon_ace *current_ace;
1493	int i, entries;
1494
1495	entries = count_canon_ace_list(ace);
1496	got_user_obj = False;
1497	got_group_obj = False;
1498
1499	for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1500	if (current_ace->type == SMB_ACL_USER_OBJ)
1501	got_user_obj = True;
1502	else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1503	got_group_obj = True;
1504	}
1505	if (got_user_obj && got_group_obj) {
1506	DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1507	return;
1508	}
1509
1510	for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1511	if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1512	sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1513	current_ace->type = SMB_ACL_USER_OBJ;
1514	got_user_obj = True;
1515	}
1516	if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1517	sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1518	current_ace->type = SMB_ACL_GROUP_OBJ;
1519	got_group_obj = True;
1520	}
1521	}
1522	if (!got_user_obj)
1523	DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1524	if (!got_group_obj)
1525	DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1526	}
1527
1528	/****************************************************************************
1529	If an ACE entry is SMB_ACL_USER_OBJ and not CREATOR_OWNER, map to SMB_ACL_USER.
1530	If an ACE entry is SMB_ACL_GROUP_OBJ and not CREATOR_GROUP, map to SMB_ACL_GROUP
1531	****************************************************************************/
1532
1533	static bool dup_owning_ace(canon_ace dir_ace, canon_ace ace)
1534	{
1535	/* dir ace must be followings.
1536	SMB_ACL_USER_OBJ : trustee(CREATOR_OWNER) -> Posix ACL d:u::perm
1537	SMB_ACL_USER : not trustee -> Posix ACL u:user:perm
1538	SMB_ACL_USER_OBJ : trustee -> convert to SMB_ACL_USER : trustee
1539	Posix ACL u:trustee:perm
1540
1541	SMB_ACL_GROUP_OBJ: trustee(CREATOR_GROUP) -> Posix ACL d:g::perm
1542	SMB_ACL_GROUP : not trustee -> Posix ACL g:group:perm
1543	SMB_ACL_GROUP_OBJ: trustee -> convert to SMB_ACL_GROUP : trustee
1544	Posix ACL g:trustee:perm
1545	*/
1546
1547	if (ace->type == SMB_ACL_USER_OBJ &&
1548	!(sid_equal(&ace->trustee, &global_sid_Creator_Owner))) {
1549	canon_ace *dup_ace = dup_canon_ace(ace);
1550
1551	if (dup_ace == NULL) {
1552	return false;
1553	}
1554	dup_ace->type = SMB_ACL_USER;
1555	DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1556	}
1557
1558	if (ace->type == SMB_ACL_GROUP_OBJ &&
1559	!(sid_equal(&ace->trustee, &global_sid_Creator_Group))) {
1560	canon_ace *dup_ace = dup_canon_ace(ace);
1561
1562	if (dup_ace == NULL) {
1563	return false;
1564	}
1565	dup_ace->type = SMB_ACL_GROUP;
1566	DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1567	}
1568
1569	return true;
1570	}
1571
1572	/****************************************************************************
1573	Unpack a SEC_DESC into two canonical ace lists.
1574	****************************************************************************/
1575
1576	static bool create_canon_ace_lists(files_struct *fsp,
1577	const SMB_STRUCT_STAT *pst,
1578	DOM_SID *pfile_owner_sid,
1579	DOM_SID *pfile_grp_sid,
1580	canon_ace **ppfile_ace,
1581	canon_ace **ppdir_ace,
1582	const SEC_ACL *dacl)
1583	{
1584	bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1585	canon_ace *file_ace = NULL;
1586	canon_ace *dir_ace = NULL;
1587	canon_ace *current_ace = NULL;
1588	bool got_dir_allow = False;
1589	bool got_file_allow = False;
1590	int i, j;
1591
1592	*ppfile_ace = NULL;
1593	*ppdir_ace = NULL;
1594
1595	/*
1596	* Convert the incoming ACL into a more regular form.
1597	*/
1598
1599	for(i = 0; i < dacl->num_aces; i++) {
1600	SEC_ACE *psa = &dacl->aces[i];
1601
1602	if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1603	DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1604	return False;
1605	}
1606
1607	if (nt4_compatible_acls()) {
1608	/*
1609	* The security mask may be UNIX_ACCESS_NONE which should map into
1610	* no permissions (we overload the WRITE_OWNER bit for this) or it
1611	* should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1612	* to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1613	*/
1614
1615	/*
1616	* Convert GENERIC bits to specific bits.
1617	*/
1618
1619	se_map_generic(&psa->access_mask, &file_generic_mapping);
1620
1621	psa->access_mask &= (UNIX_ACCESS_NONE\|FILE_ALL_ACCESS);
1622
1623	if(psa->access_mask != UNIX_ACCESS_NONE)
1624	psa->access_mask &= ~UNIX_ACCESS_NONE;
1625	}
1626	}
1627
1628	/*
1629	* Deal with the fact that NT 4.x re-writes the canonical format
1630	* that we return for default ACLs. If a directory ACE is identical
1631	* to a inherited directory ACE then NT changes the bits so that the
1632	* first ACE is set to OI\|IO and the second ACE for this SID is set
1633	* to CI. We need to repair this. JRA.
1634	*/
1635
1636	for(i = 0; i < dacl->num_aces; i++) {
1637	SEC_ACE *psa1 = &dacl->aces[i];
1638
1639	for (j = i + 1; j < dacl->num_aces; j++) {
1640	SEC_ACE *psa2 = &dacl->aces[j];
1641
1642	if (psa1->access_mask != psa2->access_mask)
1643	continue;
1644
1645	if (!sid_equal(&psa1->trustee, &psa2->trustee))
1646	continue;
1647
1648	/*
1649	* Ok - permission bits and SIDs are equal.
1650	* Check if flags were re-written.
1651	*/
1652
1653	if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1654
1655	psa1->flags \|= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT\|SEC_ACE_FLAG_OBJECT_INHERIT));
1656	psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT\|SEC_ACE_FLAG_OBJECT_INHERIT);
1657
1658	} else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1659
1660	psa2->flags \|= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT\|SEC_ACE_FLAG_OBJECT_INHERIT));
1661	psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT\|SEC_ACE_FLAG_OBJECT_INHERIT);
1662
1663	}
1664	}
1665	}
1666
1667	for(i = 0; i < dacl->num_aces; i++) {
1668	SEC_ACE *psa = &dacl->aces[i];
1669
1670	/*
1671	* Create a cannon_ace entry representing this NT DACL ACE.
1672	*/
1673
1674	if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1675	free_canon_ace_list(file_ace);
1676	free_canon_ace_list(dir_ace);
1677	DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1678	return False;
1679	}
1680
1681	ZERO_STRUCTP(current_ace);
1682
1683	sid_copy(&current_ace->trustee, &psa->trustee);
1684
1685	/*
1686	* Try and work out if the SID is a user or group
1687	* as we need to flag these differently for POSIX.
1688	* Note what kind of a POSIX ACL this should map to.
1689	*/
1690
1691	if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1692	current_ace->owner_type = WORLD_ACE;
1693	current_ace->unix_ug.world = -1;
1694	current_ace->type = SMB_ACL_OTHER;
1695	} else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1696	current_ace->owner_type = UID_ACE;
1697	current_ace->unix_ug.uid = pst->st_ex_uid;
1698	current_ace->type = SMB_ACL_USER_OBJ;
1699
1700	/*
1701	* The Creator Owner entry only specifies inheritable permissions,
1702	* never access permissions. WinNT doesn't always set the ACE to
1703	* INHERIT_ONLY, though.
1704	*/
1705
1706	psa->flags \|= SEC_ACE_FLAG_INHERIT_ONLY;
1707
1708	} else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1709	current_ace->owner_type = GID_ACE;
1710	current_ace->unix_ug.gid = pst->st_ex_gid;
1711	current_ace->type = SMB_ACL_GROUP_OBJ;
1712
1713	/*
1714	* The Creator Group entry only specifies inheritable permissions,
1715	* never access permissions. WinNT doesn't always set the ACE to
1716	* INHERIT_ONLY, though.
1717	*/
1718	psa->flags \|= SEC_ACE_FLAG_INHERIT_ONLY;
1719
1720	} else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1721	current_ace->owner_type = UID_ACE;
1722	/* If it's the owning user, this is a user_obj, not
1723	* a user. */
1724	if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1725	current_ace->type = SMB_ACL_USER_OBJ;
1726	} else {
1727	current_ace->type = SMB_ACL_USER;
1728	}
1729	} else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1730	current_ace->owner_type = GID_ACE;
1731	/* If it's the primary group, this is a group_obj, not
1732	* a group. */
1733	if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1734	current_ace->type = SMB_ACL_GROUP_OBJ;
1735	} else {
1736	current_ace->type = SMB_ACL_GROUP;
1737	}
1738	} else {
1739	/*
1740	* Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1741	*/
1742
1743	if (non_mappable_sid(&psa->trustee)) {
1744	DEBUG(10, ("create_canon_ace_lists: ignoring "
1745	"non-mappable SID %s\n",
1746	sid_string_dbg(&psa->trustee)));
1747	SAFE_FREE(current_ace);
1748	continue;
1749	}
1750
1751	free_canon_ace_list(file_ace);
1752	free_canon_ace_list(dir_ace);
1753	DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1754	"%s to uid or gid.\n",
1755	sid_string_dbg(&current_ace->trustee)));
1756	SAFE_FREE(current_ace);
1757	return False;
1758	}
1759
1760	/*
1761	* Map the given NT permissions into a UNIX mode_t containing only
1762	* S_I(R\|W\|X)USR bits.
1763	*/
1764
1765	current_ace->perms \|= map_nt_perms( &psa->access_mask, S_IRUSR);
1766	current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1767
1768	/* Store the ace_flag. */
1769	current_ace->ace_flags = psa->flags;
1770
1771	/*
1772	* Now add the created ace to either the file list, the directory
1773	* list, or both. We MUST preserve the order here (hence we use
1774	* DLIST_ADD_END) as NT ACLs are order dependent.
1775	*/
1776
1777	if (fsp->is_directory) {
1778
1779	/*
1780	* We can only add to the default POSIX ACE list if the ACE is
1781	* designed to be inherited by both files and directories.
1782	*/
1783
1784	if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT\|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1785	(SEC_ACE_FLAG_OBJECT_INHERIT\|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1786
1787	DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1788
1789	/*
1790	* Note if this was an allow ace. We can't process
1791	* any further deny ace's after this.
1792	*/
1793
1794	if (current_ace->attr == ALLOW_ACE)
1795	got_dir_allow = True;
1796
1797	if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1798	DEBUG(0,("create_canon_ace_lists: "
1799	"malformed ACL in "
1800	"inheritable ACL! Deny entry "
1801	"after Allow entry. Failing "
1802	"to set on file %s.\n",
1803	fsp_str_dbg(fsp)));
1804	free_canon_ace_list(file_ace);
1805	free_canon_ace_list(dir_ace);
1806	return False;
1807	}
1808
1809	if( DEBUGLVL( 10 )) {
1810	dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1811	print_canon_ace( current_ace, 0);
1812	}
1813
1814	/*
1815	* We have a lossy mapping: directory ACE entries
1816	* CREATOR_OWNER ------\
1817	* (map to) +---> SMB_ACL_USER_OBJ
1818	* owning sid ------/
1819	*
1820	* CREATOR_GROUP ------\
1821	* (map to) +---> SMB_ACL_GROUP_OBJ
1822	* primary group sid --/
1823	*
1824	* on set. And on read of a directory ACL
1825	*
1826	* SMB_ACL_USER_OBJ ----> CREATOR_OWNER
1827	* SMB_ACL_GROUP_OBJ ---> CREATOR_GROUP.
1828	*
1829	* Deal with this on set by duplicating
1830	* owning sid and primary group sid ACE
1831	* entries into the directory ACL.
1832	* Fix from Tsukasa Hamano <hamano@osstech.co.jp>.
1833	*/
1834
1835	if (!dup_owning_ace(dir_ace, current_ace)) {
1836	DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1837	free_canon_ace_list(file_ace);
1838	free_canon_ace_list(dir_ace);
1839	return false;
1840	}
1841
1842	/*
1843	* If this is not an inherit only ACE we need to add a duplicate
1844	* to the file acl.
1845	*/
1846
1847	if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1848	canon_ace *dup_ace = dup_canon_ace(current_ace);
1849
1850	if (!dup_ace) {
1851	DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1852	free_canon_ace_list(file_ace);
1853	free_canon_ace_list(dir_ace);
1854	return False;
1855	}
1856
1857	/*
1858	* We must not free current_ace here as its
1859	* pointer is now owned by the dir_ace list.
1860	*/
1861	current_ace = dup_ace;
1862	/* We've essentially split this ace into two,
1863	* and added the ace with inheritance request
1864	* bits to the directory ACL. Drop those bits for
1865	* the ACE we're adding to the file list. */
1866	current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT\|
1867	SEC_ACE_FLAG_CONTAINER_INHERIT\|
1868	SEC_ACE_FLAG_INHERIT_ONLY);
1869	} else {
1870	/*
1871	* We must not free current_ace here as its
1872	* pointer is now owned by the dir_ace list.
1873	*/
1874	current_ace = NULL;
1875	}
1876	}
1877	}
1878
1879	/*
1880	* Only add to the file ACL if not inherit only.
1881	*/
1882
1883	if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1884	DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1885
1886	/*
1887	* Note if this was an allow ace. We can't process
1888	* any further deny ace's after this.
1889	*/
1890
1891	if (current_ace->attr == ALLOW_ACE)
1892	got_file_allow = True;
1893
1894	if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1895	DEBUG(0,("create_canon_ace_lists: malformed "
1896	"ACL in file ACL ! Deny entry after "
1897	"Allow entry. Failing to set on file "
1898	"%s.\n", fsp_str_dbg(fsp)));
1899	free_canon_ace_list(file_ace);
1900	free_canon_ace_list(dir_ace);
1901	return False;
1902	}
1903
1904	if( DEBUGLVL( 10 )) {
1905	dbgtext("create_canon_ace_lists: adding file ACL:\n");
1906	print_canon_ace( current_ace, 0);
1907	}
1908	all_aces_are_inherit_only = False;
1909	/*
1910	* We must not free current_ace here as its
1911	* pointer is now owned by the file_ace list.
1912	*/
1913	current_ace = NULL;
1914	}
1915
1916	/*
1917	* Free if ACE was not added.
1918	*/
1919
1920	SAFE_FREE(current_ace);
1921	}
1922
1923	if (fsp->is_directory && all_aces_are_inherit_only) {
1924	/*
1925	* Windows 2000 is doing one of these weird 'inherit acl'
1926	* traverses to conserve NTFS ACL resources. Just pretend
1927	* there was no DACL sent. JRA.
1928	*/
1929
1930	DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1931	free_canon_ace_list(file_ace);
1932	free_canon_ace_list(dir_ace);
1933	file_ace = NULL;
1934	dir_ace = NULL;
1935	} else {
1936	/*
1937	* Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1938	* ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1939	* entries can be converted to *_OBJ. Usually we will already have these
1940	* entries in the Default ACL, and the Access ACL will not have them.
1941	*/
1942	if (file_ace) {
1943	check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1944	}
1945	if (dir_ace) {
1946	check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1947	}
1948	}
1949
1950	*ppfile_ace = file_ace;
1951	*ppdir_ace = dir_ace;
1952
1953	return True;
1954	}
1955
1956	/****************************************************************************
1957	ASCII art time again... JRA :-).
1958
1959	We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1960	we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1961	entries). Secondly, the merge code has ensured that all duplicate SID entries for
1962	allow or deny have been merged, so the same SID can only appear once in the deny
1963	list or once in the allow list.
1964
1965	We then process as follows :
1966
1967	---------------------------------------------------------------------------
1968	First pass - look for a Everyone DENY entry.
1969
1970	If it is deny all (rwx) trunate the list at this point.
1971	Else, walk the list from this point and use the deny permissions of this
1972	entry as a mask on all following allow entries. Finally, delete
1973	the Everyone DENY entry (we have applied it to everything possible).
1974
1975	In addition, in this pass we remove any DENY entries that have
1976	no permissions (ie. they are a DENY nothing).
1977	---------------------------------------------------------------------------
1978	Second pass - only deal with deny user entries.
1979
1980	DENY user1 (perms XXX)
1981
1982	new_perms = 0
1983	for all following allow group entries where user1 is in group
1984	new_perms \|= group_perms;
1985
1986	user1 entry perms = new_perms & ~ XXX;
1987
1988	Convert the deny entry to an allow entry with the new perms and
1989	push to the end of the list. Note if the user was in no groups
1990	this maps to a specific allow nothing entry for this user.
1991
1992	The common case from the NT ACL choser (userX deny all) is
1993	optimised so we don't do the group lookup - we just map to
1994	an allow nothing entry.
1995
1996	What we're doing here is inferring the allow permissions the
1997	person setting the ACE on user1 wanted by looking at the allow
1998	permissions on the groups the user is currently in. This will
1999	be a snapshot, depending on group membership but is the best
2000	we can do and has the advantage of failing closed rather than
2001	open.
2002	---------------------------------------------------------------------------
2003	Third pass - only deal with deny group entries.
2004
2005	DENY group1 (perms XXX)
2006
2007	for all following allow user entries where user is in group1
2008	user entry perms = user entry perms & ~ XXX;
2009
2010	If there is a group Everyone allow entry with permissions YYY,
2011	convert the group1 entry to an allow entry and modify its
2012	permissions to be :
2013
2014	new_perms = YYY & ~ XXX
2015
2016	and push to the end of the list.
2017
2018	If there is no group Everyone allow entry then convert the
2019	group1 entry to a allow nothing entry and push to the end of the list.
2020
2021	Note that the common case from the NT ACL choser (groupX deny all)
2022	cannot be optimised here as we need to modify user entries who are
2023	in the group to change them to a deny all also.
2024
2025	What we're doing here is modifying the allow permissions of
2026	user entries (which are more specific in POSIX ACLs) to mask
2027	out the explicit deny set on the group they are in. This will
2028	be a snapshot depending on current group membership but is the
2029	best we can do and has the advantage of failing closed rather
2030	than open.
2031	---------------------------------------------------------------------------
2032	Fourth pass - cope with cumulative permissions.
2033
2034	for all allow user entries, if there exists an allow group entry with
2035	more permissive permissions, and the user is in that group, rewrite the
2036	allow user permissions to contain both sets of permissions.
2037
2038	Currently the code for this is #ifdef'ed out as these semantics make
2039	no sense to me. JRA.
2040	---------------------------------------------------------------------------
2041
2042	Note we MUST do the deny user pass first as this will convert deny user
2043	entries into allow user entries which can then be processed by the deny
2044	group pass.
2045
2046	The above algorithm took a lot of thinking about - hence this
2047	explaination :-). JRA.
2048	****************************************************************************/
2049
2050	/****************************************************************************
2051	Process a canon_ace list entries. This is very complex code. We need
2052	to go through and remove the "deny" permissions from any allow entry that matches
2053	the id of this entry. We have already refused any NT ACL that wasn't in correct
2054	order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2055	we just remove it (to fail safe). We have already removed any duplicate ace
2056	entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2057	allow entries.
2058	****************************************************************************/
2059
2060	static void process_deny_list( canon_ace **pp_ace_list )
2061	{
2062	canon_ace ace_list = pp_ace_list;
2063	canon_ace *curr_ace = NULL;
2064	canon_ace *curr_ace_next = NULL;
2065
2066	/* Pass 1 above - look for an Everyone, deny entry. */
2067
2068	for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2069	canon_ace *allow_ace_p;
2070
2071	curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2072
2073	if (curr_ace->attr != DENY_ACE)
2074	continue;
2075
2076	if (curr_ace->perms == (mode_t)0) {
2077
2078	/* Deny nothing entry - delete. */
2079
2080	DLIST_REMOVE(ace_list, curr_ace);
2081	continue;
2082	}
2083
2084	if (!sid_equal(&curr_ace->trustee, &global_sid_World))
2085	continue;
2086
2087	/* JRATEST - assert. */
2088	SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2089
2090	if (curr_ace->perms == ALL_ACE_PERMS) {
2091
2092	/*
2093	* Optimisation. This is a DENY_ALL to Everyone. Truncate the
2094	* list at this point including this entry.
2095	*/
2096
2097	canon_ace *prev_entry = curr_ace->prev;
2098
2099	free_canon_ace_list( curr_ace );
2100	if (prev_entry)
2101	prev_entry->next = NULL;
2102	else {
2103	/* We deleted the entire list. */
2104	ace_list = NULL;
2105	}
2106	break;
2107	}
2108
2109	for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2110
2111	/*
2112	* Only mask off allow entries.
2113	*/
2114
2115	if (allow_ace_p->attr != ALLOW_ACE)
2116	continue;
2117
2118	allow_ace_p->perms &= ~curr_ace->perms;
2119	}
2120
2121	/*
2122	* Now it's been applied, remove it.
2123	*/
2124
2125	DLIST_REMOVE(ace_list, curr_ace);
2126	}
2127
2128	/* Pass 2 above - deal with deny user entries. */
2129
2130	for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2131	mode_t new_perms = (mode_t)0;
2132	canon_ace *allow_ace_p;
2133
2134	curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2135
2136	if (curr_ace->attr != DENY_ACE)
2137	continue;
2138
2139	if (curr_ace->owner_type != UID_ACE)
2140	continue;
2141
2142	if (curr_ace->perms == ALL_ACE_PERMS) {
2143
2144	/*
2145	* Optimisation - this is a deny everything to this user.
2146	* Convert to an allow nothing and push to the end of the list.
2147	*/
2148
2149	curr_ace->attr = ALLOW_ACE;
2150	curr_ace->perms = (mode_t)0;
2151	DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2152	continue;
2153	}
2154
2155	for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2156
2157	if (allow_ace_p->attr != ALLOW_ACE)
2158	continue;
2159
2160	/* We process GID_ACE and WORLD_ACE entries only. */
2161
2162	if (allow_ace_p->owner_type == UID_ACE)
2163	continue;
2164
2165	if (uid_entry_in_group( curr_ace, allow_ace_p))
2166	new_perms \|= allow_ace_p->perms;
2167	}
2168
2169	/*
2170	* Convert to a allow entry, modify the perms and push to the end
2171	* of the list.
2172	*/
2173
2174	curr_ace->attr = ALLOW_ACE;
2175	curr_ace->perms = (new_perms & ~curr_ace->perms);
2176	DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2177	}
2178
2179	/* Pass 3 above - deal with deny group entries. */
2180
2181	for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2182	canon_ace *allow_ace_p;
2183	canon_ace *allow_everyone_p = NULL;
2184
2185	curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2186
2187	if (curr_ace->attr != DENY_ACE)
2188	continue;
2189
2190	if (curr_ace->owner_type != GID_ACE)
2191	continue;
2192
2193	for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2194
2195	if (allow_ace_p->attr != ALLOW_ACE)
2196	continue;
2197
2198	/* Store a pointer to the Everyone allow, if it exists. */
2199	if (allow_ace_p->owner_type == WORLD_ACE)
2200	allow_everyone_p = allow_ace_p;
2201
2202	/* We process UID_ACE entries only. */
2203
2204	if (allow_ace_p->owner_type != UID_ACE)
2205	continue;
2206
2207	/* Mask off the deny group perms. */
2208
2209	if (uid_entry_in_group( allow_ace_p, curr_ace))
2210	allow_ace_p->perms &= ~curr_ace->perms;
2211	}
2212
2213	/*
2214	* Convert the deny to an allow with the correct perms and
2215	* push to the end of the list.
2216	*/
2217
2218	curr_ace->attr = ALLOW_ACE;
2219	if (allow_everyone_p)
2220	curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2221	else
2222	curr_ace->perms = (mode_t)0;
2223	DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2224	}
2225
2226	/* Doing this fourth pass allows Windows semantics to be layered
2227	* on top of POSIX semantics. I'm not sure if this is desirable.
2228	* For example, in W2K ACLs there is no way to say, "Group X no
2229	* access, user Y full access" if user Y is a member of group X.
2230	* This seems completely broken semantics to me.... JRA.
2231	*/
2232
2233	#if 0
2234	/* Pass 4 above - deal with allow entries. */
2235
2236	for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2237	canon_ace *allow_ace_p;
2238
2239	curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2240
2241	if (curr_ace->attr != ALLOW_ACE)
2242	continue;
2243
2244	if (curr_ace->owner_type != UID_ACE)
2245	continue;
2246
2247	for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2248
2249	if (allow_ace_p->attr != ALLOW_ACE)
2250	continue;
2251
2252	/* We process GID_ACE entries only. */
2253
2254	if (allow_ace_p->owner_type != GID_ACE)
2255	continue;
2256
2257	/* OR in the group perms. */
2258
2259	if (uid_entry_in_group( curr_ace, allow_ace_p))
2260	curr_ace->perms \|= allow_ace_p->perms;
2261	}
2262	}
2263	#endif
2264
2265	*pp_ace_list = ace_list;
2266	}
2267
2268	/****************************************************************************
2269	Create a default mode that will be used if a security descriptor entry has
2270	no user/group/world entries.
2271	****************************************************************************/
2272
2273	static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2274	{
2275	int snum = SNUM(fsp->conn);
2276	mode_t and_bits = (mode_t)0;
2277	mode_t or_bits = (mode_t)0;
2278	mode_t mode;
2279
2280	if (interitable_mode) {
2281	mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE,
2282	fsp->fsp_name, NULL);
2283	} else {
2284	mode = S_IRUSR;
2285	}
2286
2287	if (fsp->is_directory)
2288	mode \|= (S_IWUSR\|S_IXUSR);
2289
2290	/*
2291	* Now AND with the create mode/directory mode bits then OR with the
2292	* force create mode/force directory mode bits.
2293	*/
2294
2295	if (fsp->is_directory) {
2296	and_bits = lp_dir_security_mask(snum);
2297	or_bits = lp_force_dir_security_mode(snum);
2298	} else {
2299	and_bits = lp_security_mask(snum);
2300	or_bits = lp_force_security_mode(snum);
2301	}
2302
2303	return ((mode & and_bits)\|or_bits);
2304	}
2305
2306	/****************************************************************************
2307	Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2308	succeeding.
2309	****************************************************************************/
2310
2311	static bool unpack_canon_ace(files_struct *fsp,
2312	const SMB_STRUCT_STAT *pst,
2313	DOM_SID *pfile_owner_sid,
2314	DOM_SID *pfile_grp_sid,
2315	canon_ace **ppfile_ace,
2316	canon_ace **ppdir_ace,
2317	uint32 security_info_sent,
2318	const SEC_DESC *psd)
2319	{
2320	SMB_STRUCT_STAT st;
2321	canon_ace *file_ace = NULL;
2322	canon_ace *dir_ace = NULL;
2323
2324	*ppfile_ace = NULL;
2325	*ppdir_ace = NULL;
2326
2327	if(security_info_sent == 0) {
2328	DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2329	return False;
2330	}
2331
2332	/*
2333	* If no DACL then this is a chown only security descriptor.
2334	*/
2335
2336	if(!(security_info_sent & DACL_SECURITY_INFORMATION) \|\| !psd->dacl)
2337	return True;
2338
2339	/*
2340	* Now go through the DACL and create the canon_ace lists.
2341	*/
2342
2343	if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2344	&file_ace, &dir_ace, psd->dacl))
2345	return False;
2346
2347	if ((file_ace == NULL) && (dir_ace == NULL)) {
2348	/* W2K traverse DACL set - ignore. */
2349	return True;
2350	}
2351
2352	/*
2353	* Go through the canon_ace list and merge entries
2354	* belonging to identical users of identical allow or deny type.
2355	* We can do this as all deny entries come first, followed by
2356	* all allow entries (we have mandated this before accepting this acl).
2357	*/
2358
2359	print_canon_ace_list( "file ace - before merge", file_ace);
2360	merge_aces( &file_ace, false);
2361
2362	print_canon_ace_list( "dir ace - before merge", dir_ace);
2363	merge_aces( &dir_ace, true);
2364
2365	/*
2366	* NT ACLs are order dependent. Go through the acl lists and
2367	* process DENY entries by masking the allow entries.
2368	*/
2369
2370	print_canon_ace_list( "file ace - before deny", file_ace);
2371	process_deny_list( &file_ace);
2372
2373	print_canon_ace_list( "dir ace - before deny", dir_ace);
2374	process_deny_list( &dir_ace);
2375
2376	/*
2377	* A well formed POSIX file or default ACL has at least 3 entries, a
2378	* SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2379	* and optionally a mask entry. Ensure this is the case.
2380	*/
2381
2382	print_canon_ace_list( "file ace - before valid", file_ace);
2383
2384	st = *pst;
2385
2386	/*
2387	* A default 3 element mode entry for a file should be r-- --- ---.
2388	* A default 3 element mode entry for a directory should be rwx --- ---.
2389	*/
2390
2391	st.st_ex_mode = create_default_mode(fsp, False);
2392
2393	if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params,
2394	fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2395	free_canon_ace_list(file_ace);
2396	free_canon_ace_list(dir_ace);
2397	return False;
2398	}
2399
2400	print_canon_ace_list( "dir ace - before valid", dir_ace);
2401
2402	/*
2403	* A default inheritable 3 element mode entry for a directory should be the
2404	* mode Samba will use to create a file within. Ensure user rwx bits are set if
2405	* it's a directory.
2406	*/
2407
2408	st.st_ex_mode = create_default_mode(fsp, True);
2409
2410	if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params,
2411	fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2412	free_canon_ace_list(file_ace);
2413	free_canon_ace_list(dir_ace);
2414	return False;
2415	}
2416
2417	print_canon_ace_list( "file ace - return", file_ace);
2418	print_canon_ace_list( "dir ace - return", dir_ace);
2419
2420	*ppfile_ace = file_ace;
2421	*ppdir_ace = dir_ace;
2422	return True;
2423
2424	}
2425
2426	/******************************************************************************
2427	When returning permissions, try and fit NT display
2428	semantics if possible. Note the the canon_entries here must have been malloced.
2429	The list format should be - first entry = owner, followed by group and other user
2430	entries, last entry = other.
2431
2432	Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2433	are not ordered, and match on the most specific entry rather than walking a list,
2434	then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2435
2436	Entry 0: owner : deny all except read and write.
2437	Entry 1: owner : allow read and write.
2438	Entry 2: group : deny all except read.
2439	Entry 3: group : allow read.
2440	Entry 4: Everyone : allow read.
2441
2442	But NT cannot display this in their ACL editor !
2443	********************************************************************************/
2444
2445	static void arrange_posix_perms(const char filename, canon_ace *pp_list_head)
2446	{
2447	canon_ace l_head = pp_list_head;
2448	canon_ace *owner_ace = NULL;
2449	canon_ace *other_ace = NULL;
2450	canon_ace *ace = NULL;
2451
2452	for (ace = l_head; ace; ace = ace->next) {
2453	if (ace->type == SMB_ACL_USER_OBJ)
2454	owner_ace = ace;
2455	else if (ace->type == SMB_ACL_OTHER) {
2456	/* Last ace - this is "other" */
2457	other_ace = ace;
2458	}
2459	}
2460
2461	if (!owner_ace \|\| !other_ace) {
2462	DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2463	filename ));
2464	return;
2465	}
2466
2467	/*
2468	* The POSIX algorithm applies to owner first, and other last,
2469	* so ensure they are arranged in this order.
2470	*/
2471
2472	if (owner_ace) {
2473	DLIST_PROMOTE(l_head, owner_ace);
2474	}
2475
2476	if (other_ace) {
2477	DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2478	}
2479
2480	/* We have probably changed the head of the list. */
2481
2482	*pp_list_head = l_head;
2483	}
2484
2485	/****************************************************************************
2486	Create a linked list of canonical ACE entries.
2487	****************************************************************************/
2488
2489	static canon_ace canonicalise_acl(struct connection_struct conn,
2490	const char *fname, SMB_ACL_T posix_acl,
2491	const SMB_STRUCT_STAT *psbuf,
2492	const DOM_SID powner, const DOM_SID pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2493	{
2494	mode_t acl_mask = (S_IRUSR\|S_IWUSR\|S_IXUSR);
2495	canon_ace *l_head = NULL;
2496	canon_ace *ace = NULL;
2497	canon_ace *next_ace = NULL;
2498	int entry_id = SMB_ACL_FIRST_ENTRY;
2499	SMB_ACL_ENTRY_T entry;
2500	size_t ace_count;
2501
2502	while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2503	SMB_ACL_TAG_T tagtype;
2504	SMB_ACL_PERMSET_T permset;
2505	DOM_SID sid;
2506	posix_id unix_ug;
2507	enum ace_owner owner_type;
2508
2509	entry_id = SMB_ACL_NEXT_ENTRY;
2510
2511	/* Is this a MASK entry ? */
2512	if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2513	continue;
2514
2515	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2516	continue;
2517
2518	/* Decide which SID to use based on the ACL type. */
2519	switch(tagtype) {
2520	case SMB_ACL_USER_OBJ:
2521	/* Get the SID from the owner. */
2522	sid_copy(&sid, powner);
2523	unix_ug.uid = psbuf->st_ex_uid;
2524	owner_type = UID_ACE;
2525	break;
2526	case SMB_ACL_USER:
2527	{
2528	uid_t puid = (uid_t )SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2529	if (puid == NULL) {
2530	DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2531	continue;
2532	}
2533	uid_to_sid( &sid, *puid);
2534	unix_ug.uid = *puid;
2535	owner_type = UID_ACE;
2536	SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2537	break;
2538	}
2539	case SMB_ACL_GROUP_OBJ:
2540	/* Get the SID from the owning group. */
2541	sid_copy(&sid, pgroup);
2542	unix_ug.gid = psbuf->st_ex_gid;
2543	owner_type = GID_ACE;
2544	break;
2545	case SMB_ACL_GROUP:
2546	{
2547	gid_t pgid = (gid_t )SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2548	if (pgid == NULL) {
2549	DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2550	continue;
2551	}
2552	gid_to_sid( &sid, *pgid);
2553	unix_ug.gid = *pgid;
2554	owner_type = GID_ACE;
2555	SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2556	break;
2557	}
2558	case SMB_ACL_MASK:
2559	acl_mask = convert_permset_to_mode_t(conn, permset);
2560	continue; /* Don't count the mask as an entry. */
2561	case SMB_ACL_OTHER:
2562	/* Use the Everyone SID */
2563	sid = global_sid_World;
2564	unix_ug.world = -1;
2565	owner_type = WORLD_ACE;
2566	break;
2567	default:
2568	DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2569	continue;
2570	}
2571
2572	/*
2573	* Add this entry to the list.
2574	*/
2575
2576	if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2577	goto fail;
2578
2579	ZERO_STRUCTP(ace);
2580	ace->type = tagtype;
2581	ace->perms = convert_permset_to_mode_t(conn, permset);
2582	ace->attr = ALLOW_ACE;
2583	ace->trustee = sid;
2584	ace->unix_ug = unix_ug;
2585	ace->owner_type = owner_type;
2586	ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2587
2588	DLIST_ADD(l_head, ace);
2589	}
2590
2591	/*
2592	* This next call will ensure we have at least a user/group/world set.
2593	*/
2594
2595	if (!ensure_canon_entry_valid(&l_head, conn->params,
2596	S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2597	psbuf, False))
2598	goto fail;
2599
2600	/*
2601	* Now go through the list, masking the permissions with the
2602	* acl_mask. Ensure all DENY Entries are at the start of the list.
2603	*/
2604
2605	DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2606
2607	for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2608	next_ace = ace->next;
2609
2610	/* Masks are only applied to entries other than USER_OBJ and OTHER. */
2611	if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2612	ace->perms &= acl_mask;
2613
2614	if (ace->perms == 0) {
2615	DLIST_PROMOTE(l_head, ace);
2616	}
2617
2618	if( DEBUGLVL( 10 ) ) {
2619	print_canon_ace(ace, ace_count);
2620	}
2621	}
2622
2623	arrange_posix_perms(fname,&l_head );
2624
2625	print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2626
2627	return l_head;
2628
2629	fail:
2630
2631	free_canon_ace_list(l_head);
2632	return NULL;
2633	}
2634
2635	/****************************************************************************
2636	Check if the current user group list contains a given group.
2637	****************************************************************************/
2638
2639	static bool current_user_in_group(gid_t gid)
2640	{
2641	int i;
2642
2643	for (i = 0; i < current_user.ut.ngroups; i++) {
2644	if (current_user.ut.groups[i] == gid) {
2645	return True;
2646	}
2647	}
2648
2649	return False;
2650	}
2651
2652	/****************************************************************************
2653	Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2654	****************************************************************************/
2655
2656	static bool acl_group_override(connection_struct *conn,
2657	const struct smb_filename *smb_fname)
2658	{
2659	if ((errno != EPERM) && (errno != EACCES)) {
2660	return false;
2661	}
2662
2663	/* file primary group == user primary or supplementary group */
2664	if (lp_acl_group_control(SNUM(conn)) &&
2665	current_user_in_group(smb_fname->st.st_ex_gid)) {
2666	return true;
2667	}
2668
2669	/* user has writeable permission */
2670	if (lp_dos_filemode(SNUM(conn)) &&
2671	can_write_to_file(conn, smb_fname)) {
2672	return true;
2673	}
2674
2675	return false;
2676	}
2677
2678	/****************************************************************************
2679	Attempt to apply an ACL to a file or directory.
2680	****************************************************************************/
2681
2682	static bool set_canon_ace_list(files_struct *fsp,
2683	canon_ace *the_ace,
2684	bool default_ace,
2685	const SMB_STRUCT_STAT *psbuf,
2686	bool *pacl_set_support)
2687	{
2688	connection_struct *conn = fsp->conn;
2689	bool ret = False;
2690	SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2691	canon_ace *p_ace;
2692	int i;
2693	SMB_ACL_ENTRY_T mask_entry;
2694	bool got_mask_entry = False;
2695	SMB_ACL_PERMSET_T mask_permset;
2696	SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2697	bool needs_mask = False;
2698	mode_t mask_perms = 0;
2699
2700	/* Use the psbuf that was passed in. */
2701	if (psbuf != &fsp->fsp_name->st) {
2702	fsp->fsp_name->st = *psbuf;
2703	}
2704
2705	#if defined(POSIX_ACL_NEEDS_MASK)
2706	/* HP-UX always wants to have a mask (called "class" there). */
2707	needs_mask = True;
2708	#endif
2709
2710	if (the_acl == NULL) {
2711
2712	if (!no_acl_syscall_error(errno)) {
2713	/*
2714	* Only print this error message if we have some kind of ACL
2715	* support that's not working. Otherwise we would always get this.
2716	*/
2717	DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2718	default_ace ? "default" : "file", strerror(errno) ));
2719	}
2720	*pacl_set_support = False;
2721	goto fail;
2722	}
2723
2724	if( DEBUGLVL( 10 )) {
2725	dbgtext("set_canon_ace_list: setting ACL:\n");
2726	for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2727	print_canon_ace( p_ace, i);
2728	}
2729	}
2730
2731	for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2732	SMB_ACL_ENTRY_T the_entry;
2733	SMB_ACL_PERMSET_T the_permset;
2734
2735	/*
2736	* ACLs only "need" an ACL_MASK entry if there are any named user or
2737	* named group entries. But if there is an ACL_MASK entry, it applies
2738	* to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2739	* so that it doesn't deny (i.e., mask off) any permissions.
2740	*/
2741
2742	if (p_ace->type == SMB_ACL_USER \|\| p_ace->type == SMB_ACL_GROUP) {
2743	needs_mask = True;
2744	mask_perms \|= p_ace->perms;
2745	} else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2746	mask_perms \|= p_ace->perms;
2747	}
2748
2749	/*
2750	* Get the entry for this ACE.
2751	*/
2752
2753	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2754	DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2755	i, strerror(errno) ));
2756	goto fail;
2757	}
2758
2759	if (p_ace->type == SMB_ACL_MASK) {
2760	mask_entry = the_entry;
2761	got_mask_entry = True;
2762	}
2763
2764	/*
2765	* Ok - we now know the ACL calls should be working, don't
2766	* allow fallback to chmod.
2767	*/
2768
2769	*pacl_set_support = True;
2770
2771	/*
2772	* Initialise the entry from the canon_ace.
2773	*/
2774
2775	/*
2776	* First tell the entry what type of ACE this is.
2777	*/
2778
2779	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2780	DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2781	i, strerror(errno) ));
2782	goto fail;
2783	}
2784
2785	/*
2786	* Only set the qualifier (user or group id) if the entry is a user
2787	* or group id ACE.
2788	*/
2789
2790	if ((p_ace->type == SMB_ACL_USER) \|\| (p_ace->type == SMB_ACL_GROUP)) {
2791	if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2792	DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2793	i, strerror(errno) ));
2794	goto fail;
2795	}
2796	}
2797
2798	/*
2799	* Convert the mode_t perms in the canon_ace to a POSIX permset.
2800	*/
2801
2802	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2803	DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2804	i, strerror(errno) ));
2805	goto fail;
2806	}
2807
2808	if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2809	DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2810	(unsigned int)p_ace->perms, i, strerror(errno) ));
2811	goto fail;
2812	}
2813
2814	/*
2815	* ..and apply them to the entry.
2816	*/
2817
2818	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2819	DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2820	i, strerror(errno) ));
2821	goto fail;
2822	}
2823
2824	if( DEBUGLVL( 10 ))
2825	print_canon_ace( p_ace, i);
2826
2827	}
2828
2829	if (needs_mask && !got_mask_entry) {
2830	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2831	DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2832	goto fail;
2833	}
2834
2835	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2836	DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2837	goto fail;
2838	}
2839
2840	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2841	DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2842	goto fail;
2843	}
2844
2845	if (map_acl_perms_to_permset(conn, S_IRUSR\|S_IWUSR\|S_IXUSR, &mask_permset) == -1) {
2846	DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2847	goto fail;
2848	}
2849
2850	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2851	DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2852	goto fail;
2853	}
2854	}
2855
2856	/*
2857	* Finally apply it to the file or directory.
2858	*/
2859
2860	if(default_ace \|\| fsp->is_directory \|\| fsp->fh->fd == -1) {
2861	if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2862	the_acl_type, the_acl) == -1) {
2863	/*
2864	* Some systems allow all the above calls and only fail with no ACL support
2865	* when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2866	*/
2867	if (no_acl_syscall_error(errno)) {
2868	*pacl_set_support = False;
2869	}
2870
2871	if (acl_group_override(conn, fsp->fsp_name)) {
2872	int sret;
2873
2874	DEBUG(5,("set_canon_ace_list: acl group "
2875	"control on and current user in file "
2876	"%s primary group.\n",
2877	fsp_str_dbg(fsp)));
2878
2879	become_root();
2880	sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2881	fsp->fsp_name->base_name, the_acl_type,
2882	the_acl);
2883	unbecome_root();
2884	if (sret == 0) {
2885	ret = True;
2886	}
2887	}
2888
2889	if (ret == False) {
2890	DEBUG(2,("set_canon_ace_list: "
2891	"sys_acl_set_file type %s failed for "
2892	"file %s (%s).\n",
2893	the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2894	"directory default" : "file",
2895	fsp_str_dbg(fsp), strerror(errno)));
2896	goto fail;
2897	}
2898	}
2899	} else {
2900	if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2901	/*
2902	* Some systems allow all the above calls and only fail with no ACL support
2903	* when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2904	*/
2905	if (no_acl_syscall_error(errno)) {
2906	*pacl_set_support = False;
2907	}
2908
2909	if (acl_group_override(conn, fsp->fsp_name)) {
2910	int sret;
2911
2912	DEBUG(5,("set_canon_ace_list: acl group "
2913	"control on and current user in file "
2914	"%s primary group.\n",
2915	fsp_str_dbg(fsp)));
2916
2917	become_root();
2918	sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2919	unbecome_root();
2920	if (sret == 0) {
2921	ret = True;
2922	}
2923	}
2924
2925	if (ret == False) {
2926	DEBUG(2,("set_canon_ace_list: "
2927	"sys_acl_set_file failed for file %s "
2928	"(%s).\n",
2929	fsp_str_dbg(fsp), strerror(errno)));
2930	goto fail;
2931	}
2932	}
2933	}
2934
2935	ret = True;
2936
2937	fail:
2938
2939	if (the_acl != NULL) {
2940	SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2941	}
2942
2943	return ret;
2944	}
2945
2946	/****************************************************************************
2947	Find a particular canon_ace entry.
2948	****************************************************************************/
2949
2950	static struct canon_ace canon_ace_entry_for(struct canon_ace list, SMB_ACL_TAG_T type, posix_id *id)
2951	{
2952	while (list) {
2953	if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) \|\|
2954	(type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) \|\|
2955	(type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2956	break;
2957	list = list->next;
2958	}
2959	return list;
2960	}
2961
2962	/****************************************************************************
2963
2964	****************************************************************************/
2965
2966	SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2967	{
2968	SMB_ACL_ENTRY_T entry;
2969
2970	if (!the_acl)
2971	return NULL;
2972	if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2973	SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2974	return NULL;
2975	}
2976	return the_acl;
2977	}
2978
2979	/****************************************************************************
2980	Convert a canon_ace to a generic 3 element permission - if possible.
2981	****************************************************************************/
2982
2983	#define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2984
2985	static bool convert_canon_ace_to_posix_perms( files_struct fsp, canon_ace file_ace_list, mode_t *posix_perms)
2986	{
2987	int snum = SNUM(fsp->conn);
2988	size_t ace_count = count_canon_ace_list(file_ace_list);
2989	canon_ace *ace_p;
2990	canon_ace *owner_ace = NULL;
2991	canon_ace *group_ace = NULL;
2992	canon_ace *other_ace = NULL;
2993	mode_t and_bits;
2994	mode_t or_bits;
2995
2996	if (ace_count != 3) {
2997	DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2998	"entries for file %s to convert to posix perms.\n",
2999	fsp_str_dbg(fsp)));
3000	return False;
3001	}
3002
3003	for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3004	if (ace_p->owner_type == UID_ACE)
3005	owner_ace = ace_p;
3006	else if (ace_p->owner_type == GID_ACE)
3007	group_ace = ace_p;
3008	else if (ace_p->owner_type == WORLD_ACE)
3009	other_ace = ace_p;
3010	}
3011
3012	if (!owner_ace \|\| !group_ace \|\| !other_ace) {
3013	DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3014	"standard entries for file %s.\n", fsp_str_dbg(fsp)));
3015	return False;
3016	}
3017
3018	*posix_perms = (mode_t)0;
3019
3020	*posix_perms \|= owner_ace->perms;
3021	*posix_perms \|= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3022	*posix_perms \|= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3023	*posix_perms \|= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3024	*posix_perms \|= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3025	*posix_perms \|= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3026	*posix_perms \|= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3027
3028	/* The owner must have at least read access. */
3029
3030	*posix_perms \|= S_IRUSR;
3031	if (fsp->is_directory)
3032	*posix_perms \|= (S_IWUSR\|S_IXUSR);
3033
3034	/* If requested apply the masks. */
3035
3036	/* Get the initial bits to apply. */
3037
3038	if (fsp->is_directory) {
3039	and_bits = lp_dir_security_mask(snum);
3040	or_bits = lp_force_dir_security_mode(snum);
3041	} else {
3042	and_bits = lp_security_mask(snum);
3043	or_bits = lp_force_security_mode(snum);
3044	}
3045
3046	posix_perms = (((posix_perms) & and_bits)\|or_bits);
3047
3048	DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3049	"to perm=0%o for file %s.\n", (int)owner_ace->perms,
3050	(int)group_ace->perms, (int)other_ace->perms,
3051	(int)*posix_perms, fsp_str_dbg(fsp)));
3052
3053	return True;
3054	}
3055
3056	/****************************************************************************
3057	Incoming NT ACLs on a directory can be split into a default POSIX acl (CI\|OI\|IO) and
3058	a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3059	with CI\|OI set so it is inherited and also applies to the directory.
3060	Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3061	****************************************************************************/
3062
3063	static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
3064	{
3065	size_t i, j;
3066
3067	for (i = 0; i < num_aces; i++) {
3068	for (j = i+1; j < num_aces; j++) {
3069	uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3070	uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3071	bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3072	bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3073
3074	/* We know the lower number ACE's are file entries. */
3075	if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3076	(nt_ace_list[i].size == nt_ace_list[j].size) &&
3077	(nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3078	sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3079	(i_inh == j_inh) &&
3080	(i_flags_ni == 0) &&
3081	(j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT\|
3082	SEC_ACE_FLAG_CONTAINER_INHERIT\|
3083	SEC_ACE_FLAG_INHERIT_ONLY))) {
3084	/*
3085	* W2K wants to have access allowed zero access ACE's
3086	* at the end of the list. If the mask is zero, merge
3087	* the non-inherited ACE onto the inherited ACE.
3088	*/
3089
3090	if (nt_ace_list[i].access_mask == 0) {
3091	nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT\|SEC_ACE_FLAG_CONTAINER_INHERIT\|
3092	(i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3093	if (num_aces - i - 1 > 0)
3094	memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3095	sizeof(SEC_ACE));
3096
3097	DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3098	(unsigned int)i, (unsigned int)j ));
3099	} else {
3100	/*
3101	* These are identical except for the flags.
3102	* Merge the inherited ACE onto the non-inherited ACE.
3103	*/
3104
3105	nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT\|SEC_ACE_FLAG_CONTAINER_INHERIT\|
3106	(i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3107	if (num_aces - j - 1 > 0)
3108	memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3109	sizeof(SEC_ACE));
3110
3111	DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3112	(unsigned int)j, (unsigned int)i ));
3113	}
3114	num_aces--;
3115	break;
3116	}
3117	}
3118	}
3119
3120	return num_aces;
3121	}
3122
3123	/*
3124	* Add or Replace ACE entry.
3125	* In some cases we need to add a specific ACE for compatibility reasons.
3126	* When doing that we must make sure we are not actually creating a duplicate
3127	* entry. So we need to search whether an ACE entry already exist and eventually
3128	* replacce the access mask, or add a completely new entry if none was found.
3129	*
3130	* This function assumes the array has enough space to add a new entry without
3131	* any reallocation of memory.
3132	*/
3133
3134	static void add_or_replace_ace(SEC_ACE nt_ace_list, size_t num_aces,
3135	const DOM_SID *sid, enum security_ace_type type,
3136	uint32_t mask, uint8_t flags)
3137	{
3138	int i;
3139
3140	/* first search for a duplicate */
3141	for (i = 0; i < *num_aces; i++) {
3142	if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3143	(nt_ace_list[i].flags == flags)) break;
3144	}
3145
3146	if (i < num_aces) { / found */
3147	nt_ace_list[i].type = type;
3148	nt_ace_list[i].access_mask = mask;
3149	DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3150	i, sid_string_dbg(sid), flags));
3151	return;
3152	}
3153
3154	/* not found, append it */
3155	init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3156	}
3157
3158
3159	/****************************************************************************
3160	Reply to query a security descriptor from an fsp. If it succeeds it allocates
3161	the space for the return elements and returns the size needed to return the
3162	security descriptor. This should be the only external function needed for
3163	the UNIX style get ACL.
3164	****************************************************************************/
3165
3166	static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3167	const char *name,
3168	const SMB_STRUCT_STAT *sbuf,
3169	struct pai_val *pal,
3170	SMB_ACL_T posix_acl,
3171	SMB_ACL_T def_acl,
3172	uint32_t security_info,
3173	SEC_DESC **ppdesc)
3174	{
3175	DOM_SID owner_sid;
3176	DOM_SID group_sid;
3177	size_t sd_size = 0;
3178	SEC_ACL *psa = NULL;
3179	size_t num_acls = 0;
3180	size_t num_def_acls = 0;
3181	size_t num_aces = 0;
3182	canon_ace *file_ace = NULL;
3183	canon_ace *dir_ace = NULL;
3184	SEC_ACE *nt_ace_list = NULL;
3185	size_t num_profile_acls = 0;
3186	DOM_SID orig_owner_sid;
3187	SEC_DESC *psd = NULL;
3188	int i;
3189
3190	/*
3191	* Get the owner, group and world SIDs.
3192	*/
3193
3194	create_file_sids(sbuf, &owner_sid, &group_sid);
3195
3196	if (lp_profile_acls(SNUM(conn))) {
3197	/* For WXP SP1 the owner must be administrators. */
3198	sid_copy(&orig_owner_sid, &owner_sid);
3199	sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3200	sid_copy(&group_sid, &global_sid_Builtin_Users);
3201	num_profile_acls = 3;
3202	}
3203
3204	if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
3205
3206	/*
3207	* In the optimum case Creator Owner and Creator Group would be used for
3208	* the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3209	* would lead to usability problems under Windows: The Creator entries
3210	* are only available in browse lists of directories and not for files;
3211	* additionally the identity of the owning group couldn't be determined.
3212	* We therefore use those identities only for Default ACLs.
3213	*/
3214
3215	/* Create the canon_ace lists. */
3216	file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3217	&owner_sid, &group_sid, pal,
3218	SMB_ACL_TYPE_ACCESS);
3219
3220	/* We must have some ACLS. */
3221
3222	if (count_canon_ace_list(file_ace) == 0) {
3223	DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3224	goto done;
3225	}
3226
3227	if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3228	dir_ace = canonicalise_acl(conn, name, def_acl,
3229	sbuf,
3230	&global_sid_Creator_Owner,
3231	&global_sid_Creator_Group,
3232	pal, SMB_ACL_TYPE_DEFAULT);
3233	}
3234
3235	/*
3236	* Create the NT ACE list from the canonical ace lists.
3237	*/
3238
3239	{
3240	canon_ace *ace;
3241	enum security_ace_type nt_acl_type;
3242
3243	if (nt4_compatible_acls() && dir_ace) {
3244	/*
3245	* NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3246	* but no non-INHERIT_ONLY entry for one SID. So we only
3247	* remove entries from the Access ACL if the
3248	* corresponding Default ACL entries have also been
3249	* removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3250	* are exceptions. We can do nothing
3251	* intelligent if the Default ACL contains entries that
3252	* are not also contained in the Access ACL, so this
3253	* case will still fail under NT 4.
3254	*/
3255
3256	ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3257	if (ace && !ace->perms) {
3258	DLIST_REMOVE(dir_ace, ace);
3259	SAFE_FREE(ace);
3260
3261	ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3262	if (ace && !ace->perms) {
3263	DLIST_REMOVE(file_ace, ace);
3264	SAFE_FREE(ace);
3265	}
3266	}
3267
3268	/*
3269	* WinNT doesn't usually have Creator Group
3270	* in browse lists, so we send this entry to
3271	* WinNT even if it contains no relevant
3272	* permissions. Once we can add
3273	* Creator Group to browse lists we can
3274	* re-enable this.
3275	*/
3276
3277	#if 0
3278	ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3279	if (ace && !ace->perms) {
3280	DLIST_REMOVE(dir_ace, ace);
3281	SAFE_FREE(ace);
3282	}
3283	#endif
3284
3285	ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3286	if (ace && !ace->perms) {
3287	DLIST_REMOVE(file_ace, ace);
3288	SAFE_FREE(ace);
3289	}
3290	}
3291
3292	num_acls = count_canon_ace_list(file_ace);
3293	num_def_acls = count_canon_ace_list(dir_ace);
3294
3295	/* Allocate the ace list. */
3296	if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3297	DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3298	goto done;
3299	}
3300
3301	memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3302
3303	/*
3304	* Create the NT ACE list from the canonical ace lists.
3305	*/
3306
3307	for (ace = file_ace; ace != NULL; ace = ace->next) {
3308	uint32_t acc = map_canon_ace_perms(SNUM(conn),
3309	&nt_acl_type,
3310	ace->perms,
3311	S_ISDIR(sbuf->st_ex_mode));
3312	init_sec_ace(&nt_ace_list[num_aces++],
3313	&ace->trustee,
3314	nt_acl_type,
3315	acc,
3316	ace->ace_flags);
3317	}
3318
3319	/* The User must have access to a profile share - even
3320	* if we can't map the SID. */
3321	if (lp_profile_acls(SNUM(conn))) {
3322	add_or_replace_ace(nt_ace_list, &num_aces,
3323	&global_sid_Builtin_Users,
3324	SEC_ACE_TYPE_ACCESS_ALLOWED,
3325	FILE_GENERIC_ALL, 0);
3326	}
3327
3328	for (ace = dir_ace; ace != NULL; ace = ace->next) {
3329	uint32_t acc = map_canon_ace_perms(SNUM(conn),
3330	&nt_acl_type,
3331	ace->perms,
3332	S_ISDIR(sbuf->st_ex_mode));
3333	init_sec_ace(&nt_ace_list[num_aces++],
3334	&ace->trustee,
3335	nt_acl_type,
3336	acc,
3337	ace->ace_flags \|
3338	SEC_ACE_FLAG_OBJECT_INHERIT\|
3339	SEC_ACE_FLAG_CONTAINER_INHERIT\|
3340	SEC_ACE_FLAG_INHERIT_ONLY);
3341	}
3342
3343	/* The User must have access to a profile share - even
3344	* if we can't map the SID. */
3345	if (lp_profile_acls(SNUM(conn))) {
3346	add_or_replace_ace(nt_ace_list, &num_aces,
3347	&global_sid_Builtin_Users,
3348	SEC_ACE_TYPE_ACCESS_ALLOWED,
3349	FILE_GENERIC_ALL,
3350	SEC_ACE_FLAG_OBJECT_INHERIT \|
3351	SEC_ACE_FLAG_CONTAINER_INHERIT \|
3352	SEC_ACE_FLAG_INHERIT_ONLY);
3353	}
3354
3355	/*
3356	* Merge POSIX default ACLs and normal ACLs into one NT ACE.
3357	* Win2K needs this to get the inheritance correct when replacing ACLs
3358	* on a directory tree. Based on work by Jim @ IBM.
3359	*/
3360
3361	num_aces = merge_default_aces(nt_ace_list, num_aces);
3362
3363	if (lp_profile_acls(SNUM(conn))) {
3364	for (i = 0; i < num_aces; i++) {
3365	if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3366	add_or_replace_ace(nt_ace_list, &num_aces,
3367	&orig_owner_sid,
3368	nt_ace_list[i].type,
3369	nt_ace_list[i].access_mask,
3370	nt_ace_list[i].flags);
3371	break;
3372	}
3373	}
3374	}
3375	}
3376
3377	if (num_aces) {
3378	if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3379	DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3380	goto done;
3381	}
3382	}
3383	} /* security_info & DACL_SECURITY_INFORMATION */
3384
3385	psd = make_standard_sec_desc( talloc_tos(),
3386	(security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3387	(security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3388	psa,
3389	&sd_size);
3390
3391	if(!psd) {
3392	DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3393	sd_size = 0;
3394	goto done;
3395	}
3396
3397	/*
3398	* Windows 2000: The DACL_PROTECTED flag in the security
3399	* descriptor marks the ACL as non-inheriting, i.e., no
3400	* ACEs from higher level directories propagate to this
3401	* ACL. In the POSIX ACL model permissions are only
3402	* inherited at file create time, so ACLs never contain
3403	* any ACEs that are inherited dynamically. The DACL_PROTECTED
3404	* flag doesn't seem to bother Windows NT.
3405	* Always set this if map acl inherit is turned off.
3406	*/
3407	if (pal == NULL \|\| !lp_map_acl_inherit(SNUM(conn))) {
3408	psd->type \|= SEC_DESC_DACL_PROTECTED;
3409	} else {
3410	psd->type \|= pal->sd_type;
3411	}
3412
3413	if (psd->dacl) {
3414	dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3415	}
3416
3417	*ppdesc = psd;
3418
3419	done:
3420
3421	if (posix_acl) {
3422	SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3423	}
3424	if (def_acl) {
3425	SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3426	}
3427	free_canon_ace_list(file_ace);
3428	free_canon_ace_list(dir_ace);
3429	free_inherited_info(pal);
3430	SAFE_FREE(nt_ace_list);
3431
3432	return NT_STATUS_OK;
3433	}
3434
3435	NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3436	SEC_DESC **ppdesc)
3437	{
3438	SMB_STRUCT_STAT sbuf;
3439	SMB_ACL_T posix_acl = NULL;
3440	struct pai_val *pal;
3441
3442	*ppdesc = NULL;
3443
3444	DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3445	fsp_str_dbg(fsp)));
3446
3447	/* can it happen that fsp_name == NULL ? */
3448	if (fsp->is_directory \|\| fsp->fh->fd == -1) {
3449	return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3450	security_info, ppdesc);
3451	}
3452
3453	/* Get the stat struct for the owner info. */
3454	if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3455	return map_nt_error_from_unix(errno);
3456	}
3457
3458	/* Get the ACL from the fd. */
3459	posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3460
3461	pal = fload_inherited_info(fsp);
3462
3463	return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3464	&sbuf, pal, posix_acl, NULL,
3465	security_info, ppdesc);
3466	}
3467
3468	NTSTATUS posix_get_nt_acl(struct connection_struct conn, const char name,
3469	uint32_t security_info, SEC_DESC **ppdesc)
3470	{
3471	SMB_ACL_T posix_acl = NULL;
3472	SMB_ACL_T def_acl = NULL;
3473	struct pai_val *pal;
3474	struct smb_filename smb_fname;
3475	int ret;
3476
3477	*ppdesc = NULL;
3478
3479	DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3480
3481	ZERO_STRUCT(smb_fname);
3482	smb_fname.base_name = discard_const_p(char, name);
3483
3484	/* Get the stat struct for the owner info. */
3485	if (lp_posix_pathnames()) {
3486	ret = SMB_VFS_LSTAT(conn, &smb_fname);
3487	} else {
3488	ret = SMB_VFS_STAT(conn, &smb_fname);
3489	}
3490
3491	if (ret == -1) {
3492	return map_nt_error_from_unix(errno);
3493	}
3494
3495	/* Get the ACL from the path. */
3496	posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3497
3498	/* If it's a directory get the default POSIX ACL. */
3499	if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3500	def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3501	def_acl = free_empty_sys_acl(conn, def_acl);
3502	}
3503
3504	pal = load_inherited_info(conn, name);
3505
3506	return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3507	posix_acl, def_acl, security_info,
3508	ppdesc);
3509	}
3510
3511	/****************************************************************************
3512	Try to chown a file. We will be able to chown it under the following conditions.
3513
3514	1) If we have root privileges, then it will just work.
3515	2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3516	3) If we have SeRestorePrivilege we can change the user to any other user.
3517	4) If we have write permission to the file and dos_filemodes is set
3518	then allow chown to the currently authenticated user.
3519	****************************************************************************/
3520
3521	int try_chown(connection_struct conn, struct smb_filename smb_fname,
3522	uid_t uid, gid_t gid)
3523	{
3524	int ret;
3525	files_struct *fsp;
3526
3527	if(!CAN_WRITE(conn)) {
3528	return -1;
3529	}
3530
3531	/* Case (1). */
3532	/* try the direct way first */
3533	if (lp_posix_pathnames()) {
3534	ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid, gid);
3535	} else {
3536	ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, gid);
3537	}
3538
3539	if (ret == 0)
3540	return 0;
3541
3542	/* Case (2) / (3) */
3543	if (lp_enable_privileges()) {
3544
3545	bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3546	&se_take_ownership);
3547	bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3548	&se_restore);
3549
3550	/* Case (2) */
3551	if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) \|\|
3552	/* Case (3) */
3553	( has_restore_priv ) ) {
3554
3555	become_root();
3556	/* Keep the current file gid the same - take ownership doesn't imply group change. */
3557	if (lp_posix_pathnames()) {
3558	ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3559	(gid_t)-1);
3560	} else {
3561	ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3562	(gid_t)-1);
3563	}
3564	unbecome_root();
3565	return ret;
3566	}
3567	}
3568
3569	/* Case (4). */
3570	if (!lp_dos_filemode(SNUM(conn))) {
3571	errno = EPERM;
3572	return -1;
3573	}
3574
3575	/* only allow chown to the current user. This is more secure,
3576	and also copes with the case where the SID in a take ownership ACL is
3577	a local SID on the users workstation
3578	*/
3579	if (uid != current_user.ut.uid) {
3580	errno = EPERM;
3581	return -1;
3582	}
3583
3584	if (lp_posix_pathnames()) {
3585	ret = SMB_VFS_LSTAT(conn, smb_fname);
3586	} else {
3587	ret = SMB_VFS_STAT(conn, smb_fname);
3588	}
3589
3590	if (ret == -1) {
3591	return -1;
3592	}
3593
3594	if (!NT_STATUS_IS_OK(open_file_fchmod(NULL, conn, smb_fname, &fsp))) {
3595	return -1;
3596	}
3597
3598	become_root();
3599	/* Keep the current file gid the same. */
3600	if (fsp->fh->fd == -1) {
3601	if (lp_posix_pathnames()) {
3602	ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3603	(gid_t)-1);
3604	} else {
3605	ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3606	(gid_t)-1);
3607	}
3608	} else {
3609	ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3610	}
3611	unbecome_root();
3612
3613	close_file_fchmod(NULL, fsp);
3614
3615	return ret;
3616	}
3617
3618	#if 0
3619	/* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3620
3621	/****************************************************************************
3622	Take care of parent ACL inheritance.
3623	****************************************************************************/
3624
3625	NTSTATUS append_parent_acl(files_struct *fsp,
3626	const SEC_DESC *pcsd,
3627	SEC_DESC **pp_new_sd)
3628	{
3629	struct smb_filename *smb_dname = NULL;
3630	SEC_DESC *parent_sd = NULL;
3631	files_struct *parent_fsp = NULL;
3632	TALLOC_CTX *mem_ctx = talloc_tos();
3633	char *parent_name = NULL;
3634	SEC_ACE *new_ace = NULL;
3635	unsigned int num_aces = pcsd->dacl->num_aces;
3636	NTSTATUS status;
3637	int info;
3638	unsigned int i, j;
3639	SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3640	bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3641
3642	if (psd == NULL) {
3643	return NT_STATUS_NO_MEMORY;
3644	}
3645
3646	if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3647	NULL)) {
3648	return NT_STATUS_NO_MEMORY;
3649	}
3650
3651	status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3652	&smb_dname);
3653	if (!NT_STATUS_IS_OK(status)) {
3654	goto fail;
3655	}
3656
3657	status = SMB_VFS_CREATE_FILE(
3658	fsp->conn, /* conn */
3659	NULL, /* req */
3660	0, /* root_dir_fid */
3661	smb_dname, /* fname */
3662	FILE_READ_ATTRIBUTES, /* access_mask */
3663	FILE_SHARE_NONE, /* share_access */
3664	FILE_OPEN, /* create_disposition*/
3665	FILE_DIRECTORY_FILE, /* create_options */
3666	0, /* file_attributes */
3667	INTERNAL_OPEN_ONLY, /* oplock_request */
3668	0, /* allocation_size */
3669	NULL, /* sd */
3670	NULL, /* ea_list */
3671	&parent_fsp, /* result */
3672	&info); /* pinfo */
3673
3674	if (!NT_STATUS_IS_OK(status)) {
3675	TALLOC_FREE(smb_dname);
3676	return status;
3677	}
3678
3679	status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3680	DACL_SECURITY_INFORMATION, &parent_sd );
3681
3682	close_file(NULL, parent_fsp, NORMAL_CLOSE);
3683	TALLOC_FREE(smb_dname);
3684
3685	if (!NT_STATUS_IS_OK(status)) {
3686	return status;
3687	}
3688
3689	/*
3690	* Make room for potentially all the ACLs from
3691	* the parent. We used to add the ugw triple here,
3692	* as we knew we were dealing with POSIX ACLs.
3693	* We no longer need to do so as we can guarentee
3694	* that a default ACL from the parent directory will
3695	* be well formed for POSIX ACLs if it came from a
3696	* POSIX ACL source, and if we're not writing to a
3697	* POSIX ACL sink then we don't care if it's not well
3698	* formed. JRA.
3699	*/
3700
3701	num_aces += parent_sd->dacl->num_aces;
3702
3703	if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3704	num_aces)) == NULL) {
3705	return NT_STATUS_NO_MEMORY;
3706	}
3707
3708	/* Start by copying in all the given ACE entries. */
3709	for (i = 0; i < psd->dacl->num_aces; i++) {
3710	sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3711	}
3712
3713	/*
3714	* Note that we're ignoring "inherit permissions" here
3715	* as that really only applies to newly created files. JRA.
3716	*/
3717
3718	/* Finally append any inherited ACEs. */
3719	for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3720	SEC_ACE *se = &parent_sd->dacl->aces[j];
3721
3722	if (fsp->is_directory) {
3723	if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3724	/* Doesn't apply to a directory - ignore. */
3725	DEBUG(10,("append_parent_acl: directory %s "
3726	"ignoring non container "
3727	"inherit flags %u on ACE with sid %s "
3728	"from parent %s\n",
3729	fsp_str_dbg(fsp),
3730	(unsigned int)se->flags,
3731	sid_string_dbg(&se->trustee),
3732	parent_name));
3733	continue;
3734	}
3735	} else {
3736	if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3737	/* Doesn't apply to a file - ignore. */
3738	DEBUG(10,("append_parent_acl: file %s "
3739	"ignoring non object "
3740	"inherit flags %u on ACE with sid %s "
3741	"from parent %s\n",
3742	fsp_str_dbg(fsp),
3743	(unsigned int)se->flags,
3744	sid_string_dbg(&se->trustee),
3745	parent_name));
3746	continue;
3747	}
3748	}
3749
3750	if (is_dacl_protected) {
3751	/* If the DACL is protected it means we must
3752	* not overwrite an existing ACE entry with the
3753	* same SID. This is order N^2. Ouch :-(. JRA. */
3754	unsigned int k;
3755	for (k = 0; k < psd->dacl->num_aces; k++) {
3756	if (sid_equal(&psd->dacl->aces[k].trustee,
3757	&se->trustee)) {
3758	break;
3759	}
3760	}
3761	if (k < psd->dacl->num_aces) {
3762	/* SID matched. Ignore. */
3763	DEBUG(10,("append_parent_acl: path %s "
3764	"ignoring ACE with protected sid %s "
3765	"from parent %s\n",
3766	fsp_str_dbg(fsp),
3767	sid_string_dbg(&se->trustee),
3768	parent_name));
3769	continue;
3770	}
3771	}
3772
3773	sec_ace_copy(&new_ace[i], se);
3774	if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3775	new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3776	}
3777	new_ace[i].flags \|= SEC_ACE_FLAG_INHERITED_ACE;
3778
3779	if (fsp->is_directory) {
3780	/*
3781	* Strip off any inherit only. It's applied.
3782	*/
3783	new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3784	if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3785	/* No further inheritance. */
3786	new_ace[i].flags &=
3787	~(SEC_ACE_FLAG_CONTAINER_INHERIT\|
3788	SEC_ACE_FLAG_OBJECT_INHERIT);
3789	}
3790	} else {
3791	/*
3792	* Strip off any container or inherit
3793	* flags, they can't apply to objects.
3794	*/
3795	new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT\|
3796	SEC_ACE_FLAG_INHERIT_ONLY\|
3797	SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3798	}
3799	i++;
3800
3801	DEBUG(10,("append_parent_acl: path %s "
3802	"inheriting ACE with sid %s "
3803	"from parent %s\n",
3804	fsp_str_dbg(fsp),
3805	sid_string_dbg(&se->trustee),
3806	parent_name));
3807	}
3808
3809	psd->dacl->aces = new_ace;
3810	psd->dacl->num_aces = i;
3811	psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED\|
3812	SE_DESC_DACL_AUTO_INHERIT_REQ);
3813
3814	*pp_new_sd = psd;
3815	return status;
3816	}
3817	#endif
3818
3819	/****************************************************************************
3820	Reply to set a security descriptor on an fsp. security_info_sent is the
3821	description of the following NT ACL.
3822	This should be the only external function needed for the UNIX style set ACL.
3823	****************************************************************************/
3824
3825	NTSTATUS set_nt_acl(files_struct fsp, uint32 security_info_sent, const SEC_DESC psd)
3826	{
3827	connection_struct *conn = fsp->conn;
3828	uid_t user = (uid_t)-1;
3829	gid_t grp = (gid_t)-1;
3830	DOM_SID file_owner_sid;
3831	DOM_SID file_grp_sid;
3832	canon_ace *file_ace_list = NULL;
3833	canon_ace *dir_ace_list = NULL;
3834	bool acl_perms = False;
3835	mode_t orig_mode = (mode_t)0;
3836	NTSTATUS status;
3837	bool set_acl_as_root = false;
3838	bool acl_set_support = false;
3839	bool ret = false;
3840
3841	DEBUG(10,("set_nt_acl: called for file %s\n",
3842	fsp_str_dbg(fsp)));
3843
3844	if (!CAN_WRITE(conn)) {
3845	DEBUG(10,("set acl rejected on read-only share\n"));
3846	return NT_STATUS_MEDIA_WRITE_PROTECTED;
3847	}
3848
3849	/*
3850	* Get the current state of the file.
3851	*/
3852
3853	status = vfs_stat_fsp(fsp);
3854	if (!NT_STATUS_IS_OK(status)) {
3855	return status;
3856	}
3857
3858	/* Save the original element we check against. */
3859	orig_mode = fsp->fsp_name->st.st_ex_mode;
3860
3861	/*
3862	* Unpack the user/group/world id's.
3863	*/
3864
3865	status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3866	if (!NT_STATUS_IS_OK(status)) {
3867	return status;
3868	}
3869
3870	/*
3871	* Do we need to chown ? If so this must be done first as the incoming
3872	* CREATOR_OWNER acl will be relative to the new owner, not the old.
3873	* Noticed by Simo.
3874	*/
3875
3876	if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) \|\|
3877	(( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3878
3879	DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3880	fsp_str_dbg(fsp), (unsigned int)user,
3881	(unsigned int)grp));
3882
3883	if(try_chown(fsp->conn, fsp->fsp_name, user, grp) == -1) {
3884	DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3885	"= %s.\n", fsp_str_dbg(fsp),
3886	(unsigned int)user, (unsigned int)grp,
3887	strerror(errno)));
3888	if (errno == EPERM) {
3889	return NT_STATUS_INVALID_OWNER;
3890	}
3891	return map_nt_error_from_unix(errno);
3892	}
3893
3894	/*
3895	* Recheck the current state of the file, which may have changed.
3896	* (suid/sgid bits, for instance)
3897	*/
3898
3899	status = vfs_stat_fsp(fsp);
3900	if (!NT_STATUS_IS_OK(status)) {
3901	return status;
3902	}
3903
3904	/* Save the original element we check against. */
3905	orig_mode = fsp->fsp_name->st.st_ex_mode;
3906
3907	/* If we successfully chowned, we know we must
3908	* be able to set the acl, so do it as root.
3909	*/
3910	set_acl_as_root = true;
3911	}
3912
3913	create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3914
3915	acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3916	&file_grp_sid, &file_ace_list,
3917	&dir_ace_list, security_info_sent, psd);
3918
3919	/* Ignore W2K traverse DACL set. */
3920	if (!file_ace_list && !dir_ace_list) {
3921	return NT_STATUS_OK;
3922	}
3923
3924	if (!acl_perms) {
3925	DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3926	free_canon_ace_list(file_ace_list);
3927	free_canon_ace_list(dir_ace_list);
3928	return NT_STATUS_ACCESS_DENIED;
3929	}
3930
3931	/*
3932	* Only change security if we got a DACL.
3933	*/
3934
3935	if(!(security_info_sent & DACL_SECURITY_INFORMATION) \|\| (psd->dacl == NULL)) {
3936	free_canon_ace_list(file_ace_list);
3937	free_canon_ace_list(dir_ace_list);
3938	return NT_STATUS_OK;
3939	}
3940
3941	/*
3942	* Try using the POSIX ACL set first. Fall back to chmod if
3943	* we have no ACL support on this filesystem.
3944	*/
3945
3946	if (acl_perms && file_ace_list) {
3947	if (set_acl_as_root) {
3948	become_root();
3949	}
3950	ret = set_canon_ace_list(fsp, file_ace_list, false,
3951	&fsp->fsp_name->st, &acl_set_support);
3952	if (set_acl_as_root) {
3953	unbecome_root();
3954	}
3955	if (acl_set_support && ret == false) {
3956	DEBUG(3,("set_nt_acl: failed to set file acl on file "
3957	"%s (%s).\n", fsp_str_dbg(fsp),
3958	strerror(errno)));
3959	free_canon_ace_list(file_ace_list);
3960	free_canon_ace_list(dir_ace_list);
3961	return map_nt_error_from_unix(errno);
3962	}
3963	}
3964
3965	if (acl_perms && acl_set_support && fsp->is_directory) {
3966	if (dir_ace_list) {
3967	if (set_acl_as_root) {
3968	become_root();
3969	}
3970	ret = set_canon_ace_list(fsp, dir_ace_list, true,
3971	&fsp->fsp_name->st,
3972	&acl_set_support);
3973	if (set_acl_as_root) {
3974	unbecome_root();
3975	}
3976	if (ret == false) {
3977	DEBUG(3,("set_nt_acl: failed to set default "
3978	"acl on directory %s (%s).\n",
3979	fsp_str_dbg(fsp), strerror(errno)));
3980	free_canon_ace_list(file_ace_list);
3981	free_canon_ace_list(dir_ace_list);
3982	return map_nt_error_from_unix(errno);
3983	}
3984	} else {
3985	int sret = -1;
3986
3987	/*
3988	* No default ACL - delete one if it exists.
3989	*/
3990
3991	if (set_acl_as_root) {
3992	become_root();
3993	}
3994	sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3995	fsp->fsp_name->base_name);
3996	if (set_acl_as_root) {
3997	unbecome_root();
3998	}
3999	if (sret == -1) {
4000	if (acl_group_override(conn, fsp->fsp_name)) {
4001	DEBUG(5,("set_nt_acl: acl group "
4002	"control on and current user "
4003	"in file %s primary group. "
4004	"Override delete_def_acl\n",
4005	fsp_str_dbg(fsp)));
4006
4007	become_root();
4008	sret =
4009	SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4010	conn,
4011	fsp->fsp_name->base_name);
4012	unbecome_root();
4013	}
4014
4015	if (sret == -1) {
4016	DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4017	free_canon_ace_list(file_ace_list);
4018	free_canon_ace_list(dir_ace_list);
4019	return map_nt_error_from_unix(errno);
4020	}
4021	}
4022	}
4023	}
4024
4025	if (acl_set_support) {
4026	if (set_acl_as_root) {
4027	become_root();
4028	}
4029	store_inheritance_attributes(fsp,
4030	file_ace_list,
4031	dir_ace_list,
4032	psd->type);
4033	if (set_acl_as_root) {
4034	unbecome_root();
4035	}
4036	}
4037
4038	/*
4039	* If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4040	*/
4041
4042	if(!acl_set_support && acl_perms) {
4043	mode_t posix_perms;
4044
4045	if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4046	free_canon_ace_list(file_ace_list);
4047	free_canon_ace_list(dir_ace_list);
4048	DEBUG(3,("set_nt_acl: failed to convert file acl to "
4049	"posix permissions for file %s.\n",
4050	fsp_str_dbg(fsp)));
4051	return NT_STATUS_ACCESS_DENIED;
4052	}
4053
4054	if (orig_mode != posix_perms) {
4055	int sret = -1;
4056
4057	DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4058	fsp_str_dbg(fsp), (unsigned int)posix_perms));
4059
4060	if (set_acl_as_root) {
4061	become_root();
4062	}
4063	sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4064	posix_perms);
4065	if (set_acl_as_root) {
4066	unbecome_root();
4067	}
4068	if(sret == -1) {
4069	if (acl_group_override(conn, fsp->fsp_name)) {
4070	DEBUG(5,("set_nt_acl: acl group "
4071	"control on and current user "
4072	"in file %s primary group. "
4073	"Override chmod\n",
4074	fsp_str_dbg(fsp)));
4075
4076	become_root();
4077	sret = SMB_VFS_CHMOD(conn,
4078	fsp->fsp_name->base_name,
4079	posix_perms);
4080	unbecome_root();
4081	}
4082
4083	if (sret == -1) {
4084	DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4085	"failed. Error = %s.\n",
4086	fsp_str_dbg(fsp),
4087	(unsigned int)posix_perms,
4088	strerror(errno)));
4089	free_canon_ace_list(file_ace_list);
4090	free_canon_ace_list(dir_ace_list);
4091	return map_nt_error_from_unix(errno);
4092	}
4093	}
4094	}
4095	}
4096
4097	free_canon_ace_list(file_ace_list);
4098	free_canon_ace_list(dir_ace_list);
4099
4100	/* Ensure the stat struct in the fsp is correct. */
4101	status = vfs_stat_fsp(fsp);
4102
4103	return NT_STATUS_OK;
4104	}
4105
4106	/****************************************************************************
4107	Get the actual group bits stored on a file with an ACL. Has no effect if
4108	the file has no ACL. Needed in dosmode code where the stat() will return
4109	the mask bits, not the real group bits, for a file with an ACL.
4110	****************************************************************************/
4111
4112	int get_acl_group_bits( connection_struct conn, const char fname, mode_t *mode )
4113	{
4114	int entry_id = SMB_ACL_FIRST_ENTRY;
4115	SMB_ACL_ENTRY_T entry;
4116	SMB_ACL_T posix_acl;
4117	int result = -1;
4118
4119	posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4120	if (posix_acl == (SMB_ACL_T)NULL)
4121	return -1;
4122
4123	while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4124	SMB_ACL_TAG_T tagtype;
4125	SMB_ACL_PERMSET_T permset;
4126
4127	entry_id = SMB_ACL_NEXT_ENTRY;
4128
4129	if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4130	break;
4131
4132	if (tagtype == SMB_ACL_GROUP_OBJ) {
4133	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4134	break;
4135	} else {
4136	*mode &= ~(S_IRGRP\|S_IWGRP\|S_IXGRP);
4137	*mode \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4138	*mode \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4139	*mode \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4140	result = 0;
4141	break;
4142	}
4143	}
4144	}
4145	SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4146	return result;
4147	}
4148
4149	/****************************************************************************
4150	Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4151	and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4152	****************************************************************************/
4153
4154	static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4155	{
4156	int entry_id = SMB_ACL_FIRST_ENTRY;
4157	SMB_ACL_ENTRY_T entry;
4158	int num_entries = 0;
4159
4160	while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4161	SMB_ACL_TAG_T tagtype;
4162	SMB_ACL_PERMSET_T permset;
4163	mode_t perms;
4164
4165	entry_id = SMB_ACL_NEXT_ENTRY;
4166
4167	if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4168	return -1;
4169
4170	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4171	return -1;
4172
4173	num_entries++;
4174
4175	switch(tagtype) {
4176	case SMB_ACL_USER_OBJ:
4177	perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4178	break;
4179	case SMB_ACL_GROUP_OBJ:
4180	perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4181	break;
4182	case SMB_ACL_MASK:
4183	/*
4184	* FIXME: The ACL_MASK entry permissions should really be set to
4185	* the union of the permissions of all ACL_USER,
4186	* ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4187	* acl_calc_mask() does, but Samba ACLs doesn't provide it.
4188	*/
4189	perms = S_IRUSR\|S_IWUSR\|S_IXUSR;
4190	break;
4191	case SMB_ACL_OTHER:
4192	perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4193	break;
4194	default:
4195	continue;
4196	}
4197
4198	if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4199	return -1;
4200
4201	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4202	return -1;
4203	}
4204
4205	/*
4206	* If this is a simple 3 element ACL or no elements then it's a standard
4207	* UNIX permission set. Just use chmod...
4208	*/
4209
4210	if ((num_entries == 3) \|\| (num_entries == 0))
4211	return -1;
4212
4213	return 0;
4214	}
4215
4216	/****************************************************************************
4217	Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4218	GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4219	resulting ACL on TO. Note that name is in UNIX character set.
4220	****************************************************************************/
4221
4222	static int copy_access_posix_acl(connection_struct conn, const char from, const char *to, mode_t mode)
4223	{
4224	SMB_ACL_T posix_acl = NULL;
4225	int ret = -1;
4226
4227	if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4228	return -1;
4229
4230	if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4231	goto done;
4232
4233	ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4234
4235	done:
4236
4237	SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4238	return ret;
4239	}
4240
4241	/****************************************************************************
4242	Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4243	and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4244	Note that name is in UNIX character set.
4245	****************************************************************************/
4246
4247	int chmod_acl(connection_struct conn, const char name, mode_t mode)
4248	{
4249	return copy_access_posix_acl(conn, name, name, mode);
4250	}
4251
4252	/****************************************************************************
4253	Check for an existing default POSIX ACL on a directory.
4254	****************************************************************************/
4255
4256	static bool directory_has_default_posix_acl(connection_struct conn, const char fname)
4257	{
4258	SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4259	bool has_acl = False;
4260	SMB_ACL_ENTRY_T entry;
4261
4262	if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4263	has_acl = True;
4264	}
4265
4266	if (def_acl) {
4267	SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4268	}
4269	return has_acl;
4270	}
4271
4272	/****************************************************************************
4273	If the parent directory has no default ACL but it does have an Access ACL,
4274	inherit this Access ACL to file name.
4275	****************************************************************************/
4276
4277	int inherit_access_posix_acl(connection_struct conn, const char inherit_from_dir,
4278	const char *name, mode_t mode)
4279	{
4280	if (directory_has_default_posix_acl(conn, inherit_from_dir))
4281	return 0;
4282
4283	return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4284	}
4285
4286	/****************************************************************************
4287	Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4288	and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4289	****************************************************************************/
4290
4291	int fchmod_acl(files_struct *fsp, mode_t mode)
4292	{
4293	connection_struct *conn = fsp->conn;
4294	SMB_ACL_T posix_acl = NULL;
4295	int ret = -1;
4296
4297	if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4298	return -1;
4299
4300	if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4301	goto done;
4302
4303	ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4304
4305	done:
4306
4307	SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4308	return ret;
4309	}
4310
4311	/****************************************************************************
4312	Map from wire type to permset.
4313	****************************************************************************/
4314
4315	static bool unix_ex_wire_to_permset(connection_struct conn, unsigned char wire_perm, SMB_ACL_PERMSET_T p_permset)
4316	{
4317	if (wire_perm & ~(SMB_POSIX_ACL_READ\|SMB_POSIX_ACL_WRITE\|SMB_POSIX_ACL_EXECUTE)) {
4318	return False;
4319	}
4320
4321	if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
4322	return False;
4323	}
4324
4325	if (wire_perm & SMB_POSIX_ACL_READ) {
4326	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4327	return False;
4328	}
4329	}
4330	if (wire_perm & SMB_POSIX_ACL_WRITE) {
4331	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4332	return False;
4333	}
4334	}
4335	if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4336	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4337	return False;
4338	}
4339	}
4340	return True;
4341	}
4342
4343	/****************************************************************************
4344	Map from wire type to tagtype.
4345	****************************************************************************/
4346
4347	static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4348	{
4349	switch (wire_tt) {
4350	case SMB_POSIX_ACL_USER_OBJ:
4351	*p_tt = SMB_ACL_USER_OBJ;
4352	break;
4353	case SMB_POSIX_ACL_USER:
4354	*p_tt = SMB_ACL_USER;
4355	break;
4356	case SMB_POSIX_ACL_GROUP_OBJ:
4357	*p_tt = SMB_ACL_GROUP_OBJ;
4358	break;
4359	case SMB_POSIX_ACL_GROUP:
4360	*p_tt = SMB_ACL_GROUP;
4361	break;
4362	case SMB_POSIX_ACL_MASK:
4363	*p_tt = SMB_ACL_MASK;
4364	break;
4365	case SMB_POSIX_ACL_OTHER:
4366	*p_tt = SMB_ACL_OTHER;
4367	break;
4368	default:
4369	return False;
4370	}
4371	return True;
4372	}
4373
4374	/****************************************************************************
4375	Create a new POSIX acl from wire permissions.
4376	FIXME ! How does the share mask/mode fit into this.... ?
4377	****************************************************************************/
4378
4379	static SMB_ACL_T create_posix_acl_from_wire(connection_struct conn, uint16 num_acls, const char pdata)
4380	{
4381	unsigned int i;
4382	SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4383
4384	if (the_acl == NULL) {
4385	return NULL;
4386	}
4387
4388	for (i = 0; i < num_acls; i++) {
4389	SMB_ACL_ENTRY_T the_entry;
4390	SMB_ACL_PERMSET_T the_permset;
4391	SMB_ACL_TAG_T tag_type;
4392
4393	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4394	DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4395	i, strerror(errno) ));
4396	goto fail;
4397	}
4398
4399	if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4400	DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4401	CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4402	goto fail;
4403	}
4404
4405	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4406	DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4407	i, strerror(errno) ));
4408	goto fail;
4409	}
4410
4411	/* Get the permset pointer from the new ACL entry. */
4412	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4413	DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4414	i, strerror(errno) ));
4415	goto fail;
4416	}
4417
4418	/* Map from wire to permissions. */
4419	if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4420	DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4421	CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4422	goto fail;
4423	}
4424
4425	/* Now apply to the new ACL entry. */
4426	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4427	DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4428	i, strerror(errno) ));
4429	goto fail;
4430	}
4431
4432	if (tag_type == SMB_ACL_USER) {
4433	uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4434	uid_t uid = (uid_t)uidval;
4435	if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4436	DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4437	(unsigned int)uid, i, strerror(errno) ));
4438	goto fail;
4439	}
4440	}
4441
4442	if (tag_type == SMB_ACL_GROUP) {
4443	uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4444	gid_t gid = (uid_t)gidval;
4445	if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4446	DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4447	(unsigned int)gid, i, strerror(errno) ));
4448	goto fail;
4449	}
4450	}
4451	}
4452
4453	return the_acl;
4454
4455	fail:
4456
4457	if (the_acl != NULL) {
4458	SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4459	}
4460	return NULL;
4461	}
4462
4463	/****************************************************************************
4464	Calls from UNIX extensions - Default POSIX ACL set.
4465	If num_def_acls == 0 and not a directory just return. If it is a directory
4466	and num_def_acls == 0 then remove the default acl. Else set the default acl
4467	on the directory.
4468	****************************************************************************/
4469
4470	bool set_unix_posix_default_acl(connection_struct conn, const char fname, const SMB_STRUCT_STAT *psbuf,
4471	uint16 num_def_acls, const char *pdata)
4472	{
4473	SMB_ACL_T def_acl = NULL;
4474
4475	if (!S_ISDIR(psbuf->st_ex_mode)) {
4476	if (num_def_acls) {
4477	DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4478	errno = EISDIR;
4479	return False;
4480	} else {
4481	return True;
4482	}
4483	}
4484
4485	if (!num_def_acls) {
4486	/* Remove the default ACL. */
4487	if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4488	DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4489	fname, strerror(errno) ));
4490	return False;
4491	}
4492	return True;
4493	}
4494
4495	if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4496	return False;
4497	}
4498
4499	if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4500	DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4501	fname, strerror(errno) ));
4502	SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4503	return False;
4504	}
4505
4506	DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4507	SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4508	return True;
4509	}
4510
4511	/****************************************************************************
4512	Remove an ACL from a file. As we don't have acl_delete_entry() available
4513	we must read the current acl and copy all entries except MASK, USER and GROUP
4514	to a new acl, then set that. This (at least on Linux) causes any ACL to be
4515	removed.
4516	FIXME ! How does the share mask/mode fit into this.... ?
4517	****************************************************************************/
4518
4519	static bool remove_posix_acl(connection_struct conn, files_struct fsp, const char *fname)
4520	{
4521	SMB_ACL_T file_acl = NULL;
4522	int entry_id = SMB_ACL_FIRST_ENTRY;
4523	SMB_ACL_ENTRY_T entry;
4524	bool ret = False;
4525	/* Create a new ACL with only 3 entries, u/g/w. */
4526	SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4527	SMB_ACL_ENTRY_T user_ent = NULL;
4528	SMB_ACL_ENTRY_T group_ent = NULL;
4529	SMB_ACL_ENTRY_T other_ent = NULL;
4530
4531	if (new_file_acl == NULL) {
4532	DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4533	return False;
4534	}
4535
4536	/* Now create the u/g/w entries. */
4537	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4538	DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4539	fname, strerror(errno) ));
4540	goto done;
4541	}
4542	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4543	DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4544	fname, strerror(errno) ));
4545	goto done;
4546	}
4547
4548	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4549	DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4550	fname, strerror(errno) ));
4551	goto done;
4552	}
4553	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4554	DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4555	fname, strerror(errno) ));
4556	goto done;
4557	}
4558
4559	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4560	DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4561	fname, strerror(errno) ));
4562	goto done;
4563	}
4564	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4565	DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4566	fname, strerror(errno) ));
4567	goto done;
4568	}
4569
4570	/* Get the current file ACL. */
4571	if (fsp && fsp->fh->fd != -1) {
4572	file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4573	} else {
4574	file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4575	}
4576
4577	if (file_acl == NULL) {
4578	/* This is only returned if an error occurred. Even for a file with
4579	no acl a u/g/w acl should be returned. */
4580	DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4581	fname, strerror(errno) ));
4582	goto done;
4583	}
4584
4585	while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4586	SMB_ACL_TAG_T tagtype;
4587	SMB_ACL_PERMSET_T permset;
4588
4589	entry_id = SMB_ACL_NEXT_ENTRY;
4590
4591	if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4592	DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4593	fname, strerror(errno) ));
4594	goto done;
4595	}
4596
4597	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4598	DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4599	fname, strerror(errno) ));
4600	goto done;
4601	}
4602
4603	if (tagtype == SMB_ACL_USER_OBJ) {
4604	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4605	DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4606	fname, strerror(errno) ));
4607	}
4608	} else if (tagtype == SMB_ACL_GROUP_OBJ) {
4609	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4610	DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4611	fname, strerror(errno) ));
4612	}
4613	} else if (tagtype == SMB_ACL_OTHER) {
4614	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4615	DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4616	fname, strerror(errno) ));
4617	}
4618	}
4619	}
4620
4621	/* Set the new empty file ACL. */
4622	if (fsp && fsp->fh->fd != -1) {
4623	if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4624	DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4625	fname, strerror(errno) ));
4626	goto done;
4627	}
4628	} else {
4629	if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4630	DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4631	fname, strerror(errno) ));
4632	goto done;
4633	}
4634	}
4635
4636	ret = True;
4637
4638	done:
4639
4640	if (file_acl) {
4641	SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4642	}
4643	if (new_file_acl) {
4644	SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4645	}
4646	return ret;
4647	}
4648
4649	/****************************************************************************
4650	Calls from UNIX extensions - POSIX ACL set.
4651	If num_def_acls == 0 then read/modify/write acl after removing all entries
4652	except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4653	****************************************************************************/
4654
4655	bool set_unix_posix_acl(connection_struct conn, files_struct fsp, const char fname, uint16 num_acls, const char pdata)
4656	{
4657	SMB_ACL_T file_acl = NULL;
4658
4659	if (!num_acls) {
4660	/* Remove the ACL from the file. */
4661	return remove_posix_acl(conn, fsp, fname);
4662	}
4663
4664	if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4665	return False;
4666	}
4667
4668	if (fsp && fsp->fh->fd != -1) {
4669	/* The preferred way - use an open fd. */
4670	if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4671	DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4672	fname, strerror(errno) ));
4673	SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4674	return False;
4675	}
4676	} else {
4677	if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4678	DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4679	fname, strerror(errno) ));
4680	SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4681	return False;
4682	}
4683	}
4684
4685	DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4686	SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4687	return True;
4688	}
4689
4690	/********************************************************************
4691	Pull the NT ACL from a file on disk or the OpenEventlog() access
4692	check. Caller is responsible for freeing the returned security
4693	descriptor via TALLOC_FREE(). This is designed for dealing with
4694	user space access checks in smbd outside of the VFS. For example,
4695	checking access rights in OpenEventlog().
4696
4697	Assume we are dealing with files (for now)
4698	********************************************************************/
4699
4700	SEC_DESC get_nt_acl_no_snum( TALLOC_CTX ctx, const char *fname)
4701	{
4702	SEC_DESC psd, ret_sd;
4703	connection_struct *conn;
4704	files_struct finfo;
4705	struct fd_handle fh;
4706	NTSTATUS status;
4707
4708	conn = TALLOC_ZERO_P(ctx, connection_struct);
4709	if (conn == NULL) {
4710	DEBUG(0, ("talloc failed\n"));
4711	return NULL;
4712	}
4713
4714	if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4715	DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4716	TALLOC_FREE(conn);
4717	return NULL;
4718	}
4719
4720	conn->params->service = -1;
4721
4722	set_conn_connectpath(conn, "/");
4723
4724	if (!smbd_vfs_init(conn)) {
4725	DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4726	conn_free(conn);
4727	return NULL;
4728	}
4729
4730	ZERO_STRUCT( finfo );
4731	ZERO_STRUCT( fh );
4732
4733	finfo.fnum = -1;
4734	finfo.conn = conn;
4735	finfo.fh = &fh;
4736	finfo.fh->fd = -1;
4737
4738	status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4739	&finfo.fsp_name);
4740	if (!NT_STATUS_IS_OK(status)) {
4741	conn_free(conn);
4742	return NULL;
4743	}
4744
4745	if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4746	DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4747	TALLOC_FREE(finfo.fsp_name);
4748	conn_free(conn);
4749	return NULL;
4750	}
4751
4752	ret_sd = dup_sec_desc( ctx, psd );
4753
4754	TALLOC_FREE(finfo.fsp_name);
4755	conn_free(conn);
4756
4757	return ret_sd;
4758	}

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